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Proastiakos

The Proastiakos (Greek: Προαστιακός, meaning "suburban") is Greece's national service, operated by on infrastructure owned by the (OSE), providing affordable and frequent connections between urban centers, suburbs, ports, airports, and regional destinations in the country's major metropolitan areas. Launched initially in to support urban mobility during the 2004 , it has expanded to serve three primary networks in , , and , utilizing modern electric multiple units for reliable service on electrified lines. The service originated with the establishment of Proastiakos SA in 2003 as a of OSE, focused on developing the Athens suburban network, which was later integrated into TrainOSE through a merger in July 2007. TrainOSE, the predecessor operator, was privatized and acquired by Italy's in 2017 before rebranding as in 2022, continuing and enhancing Proastiakos operations under a 15-year concession. Today, it emphasizes accessibility with hourly frequencies, integrated ticketing valid for up to three hours after departure, and discounts for students, seniors, and disabled passengers across all zones. In Athens, the largest network connects Piraeus port to central Athens, Athens International Airport, and extends regionally to Kiato and Chalkida, facilitating transfers to intercity services and bus links to Patras in the Attica region. The Thessaloniki network, branded as the Regional Railway, links the city to Larissa in about 1.5 hours and to Florina via scenic routes passing sites like Edessa Waterfalls, with capacities of up to 500 passengers per train and temporary bus substitutions on certain segments. In Patras, the suburban line runs daily between Agios Vassilios and Kato Achaia, incorporating bus feeders to the University of Patras and Rio Hospital, divided into zoned pricing from A1 to C for efficient local travel. Overall, Proastiakos integrates with Greece's broader rail system to promote sustainable transport, connecting to tourist attractions, archaeological sites, and economic hubs while avoiding urban congestion.

History

Origins and Initial Launch

The concept of Proastiakos emerged in the early as part of broader EU-funded infrastructure initiatives aimed at modernizing Greece's network and addressing severe urban congestion in , where rapid and limited options strained road systems. These efforts were supported by structural funds under programs like the Community Support Framework (CSF III, 1994–1999), which allocated resources for upgrades to enhance regional and sustainable in major cities. The suburban system was envisioned to repurpose existing (OSE) tracks for frequent commuter services, transforming underutilized lines into efficient alternatives to . Proastiakos SA was established in as a of OSE to develop the Athens suburban network. Proastiakos officially launched in 2004, initially operating on adapted segments of ' existing rail infrastructure to provide commuter services between the city center and surrounding suburbs, with the first line to opening on 30 July 2004. Early operations focused on short-haul routes utilizing OSE's conventional lines, with services running at improved frequencies to cater to daily urban commuters. This phase marked the transition from long-distance freight and intercity focus to dedicated suburban rail, leveraging electrification and signaling upgrades funded through cohesion programs. Key milestones included the introduction of the first regular services in linking Athens Central station to northern suburbs such as Doukissis Plakentias, establishing a vital interchange point. By , integration with Line 3 at Doukissis Plakentias allowed seamless transfers, enhancing overall network accessibility and supporting the city's expanding metropolitan area. These developments laid the groundwork for further connectivity, though subsequent expansions are detailed elsewhere. Initial operations faced significant challenges, including limited availability of suitable , as OSE's fleet was primarily geared toward intercity and freight needs rather than high-frequency suburban runs. Coordination issues with OSE also arose, complicating timetable synchronization and , which occasionally led to disruptions and delayed full . Despite these hurdles, the system's debut demonstrated the potential for rail-based in .

Major Expansions and Upgrades

The Proastiakos network experienced its inaugural expansion with the opening of the line on 30 July 2004, providing a direct connection from central Athens to the airport and facilitating enhanced mobility for the . This 38-kilometer route, initially operated with diesel multiple units, represented a pivotal step in integrating suburban rail with major transport hubs. Further growth occurred on 9 July 2007, when services extended westward to Kiato, extending the network to approximately 280 kilometers and bolstering connectivity between Athens and the Peloponnese region, including key coastal areas. This upgrade supported regional economic links by offering reliable suburban transport options beyond the capital. During the 2010s, the system diversified geographically, with suburban services launching in Thessaloniki in 2007 to serve northern Greece's commuter needs and in Patras in 2010, with extension to Kato Achaia in 2019, extending the model to the western Peloponnese. Following the COVID-19 pandemic, operations underwent capacity adjustments in 2021–2022, including increased frequencies and enhanced safety protocols to accommodate rising passenger volumes during economic recovery. In September 2023, inflicted significant damage on northern rail , disrupting Proastiakos lines between Lianokladi and through flooding and track destruction spanning over 50 kilometers. Repairs progressed steadily, with partial service restorations by December 2023 and substantial completion expected by mid-2026. Complementing these physical upgrades, a major organizational shift occurred in September 2025 with the merger of OSE, ERGOSE, and GAIAOSE into , unifying management and maintenance to improve overall network efficiency and safety.

Operator and Governance

Hellenic Train Operations

was established in 2017 through the of TrainOSE S.A., which was acquired by the Italian state-owned for €45 million on September 14, 2017, marking a shift from to private operation of Greece's passenger rail services. As the successor to TrainOSE, assumed responsibility for operating the Proastiakos suburban rail networks, with full service across the , , and systems in place by September 2020, integrating them into a cohesive commuter framework. The company's operational scope encompasses daily management of schedules, maintenance, and for all three Proastiakos networks, ensuring connectivity for urban commuters and regional travelers. handles ticketing, with options for electronic purchases and flexible changes up to 10 minutes before departure, while maintaining facilities at key stations. Timetable adjustments are periodically implemented to accommodate infrastructure works, including changes effective September 15, 2025, affecting service availability on major routes. In the network, services operate with frequencies of up to every 30 minutes during peak hours on principal lines, supporting efficient daily commutes. Annual ridership on the Proastiakos suburban lines reached 10.1 million passengers in , reflecting significant usage prior to recent expansions, with ongoing growth anticipated following network enhancements and increased reliability. Following the 2023 Tempe , Hellenic has contributed to national safety initiatives, including the installation of remote train control and signaling systems aimed at preventing collisions, with upgrades targeted for completion by September 2025 across the rail network. These measures, part of broader reforms, enhance operational reliability for Proastiakos services through improved supervision and technology integration.

Regulatory Framework and Ownership Changes

The regulatory framework for Proastiakos, Greece's suburban rail service, falls under the oversight of the Ministry of and Transport, which coordinates policy and development, while the (HRADF) manages privatization and asset transfers related to rail operations. This structure ensures alignment with national transport strategies, including funding for upgrades through EU co-financing under the (TEN-T) corridors, which support interoperability and connectivity across the , , and networks. A pivotal change occurred in 2006-2007 when the (OSE) underwent structural separation, divesting its operational branch to form TrainOSE S.A. as an independent entity responsible for passenger services, including Proastiakos, while OSE retained management to comply with EU liberalization directives. This separation aimed to enhance efficiency and market openness in line with EU Railway Packages, marking one of the final such reforms among member states. In 2017, HRADF completed the of TrainOSE through a competitive tender, selling 100% of its shares to Italy's () group for €45 million, which rebranded the operator as S.A. in 2022 to consolidate suburban and intercity services under private management. This shift transferred operational control of Proastiakos to the FS subsidiary, fostering investments in and service reliability while maintaining state oversight of . By 2025, further consolidation occurred with the merger of OSE, ERGOSE (railway projects), and GAIAOSE (rail assets) into a unified entity named Greek Railways S.A. (Ellinikí Sidiródromi), effective , to streamline management, enhance safety, and integrate standards across the national , including Proastiakos lines. This reform, enacted via ministerial decree, positions the new body as the sole manager, excluding urban metros, to reduce fragmentation and support ongoing TEN-T projects. Complementing these changes, in 2025, Greek Railways signed a technical assistance agreement with for operational support, including expertise in signaling, maintenance, and safety protocols over a five-year period, to accelerate modernization post the Tempi incident. Proastiakos operations adhere to EU rail directives, such as Directive 2012/34/EU on a single European railway area for and Directive (EU) 2016/798 on railway safety, ensuring technical standards for cross-border compatibility and within the TEN-T .

Current Networks

Athens Suburban Railway

The Athens Suburban Railway, part of the Proastiakos network, comprises three lines spanning a total of 287 km and serving 53 stations, linking central Athens with surrounding suburbs, the Athens International Airport, and key ports such as Piraeus. These lines facilitate efficient commuter travel across the Attica region, supporting daily mobility for residents and visitors by connecting urban centers to peripheral areas like Kiato, Chalkida, and Ano Liosia. The core infrastructure features fully electrified tracks operating at 25 kV AC, enabling reliable and energy-efficient service throughout the network. Seamless integration with other modes occurs at major interchanges, including Doukissis Plakentias, where passengers can transfer directly to Line 3 and the system, enhancing connectivity in the . Services operate from approximately 4:30 AM to midnight daily, with frequencies up to every 15-30 minutes during peak hours, and post-2025 infrastructure upgrades are expected to boost peak-hour capacity by improving signaling and configurations to handle increased passenger volumes. A standout feature is the Airport Rail Link, offering dedicated express trains that provide swift access from central and to the in under an hour, operating hourly and catering to both commuters and tourists with checked baggage allowances. This service underscores the network's role in supporting Attica's economic hubs, distinguishing it in scale from the more regionally focused and suburban railways.

Thessaloniki Suburban Railway

The Thessaloniki Suburban Railway, operated as part of the broader system by , serves as a vital link for regional mobility in , blending commuter services within the metropolitan area with longer-distance connections to key economic and border regions. Unlike the denser, urban-focused network, it emphasizes extended reach into rural and cross-regional territories, facilitating daily commutes, , and freight integration. The infrastructure centers on the Thessaloniki New Railway , a modern hub that interconnects with intercity and high-speed services, enabling seamless transfers for passengers heading to or international destinations. The network features two lines, linking to via the electrified southern route and to via the western route, with the northern corridor to Idomeni primarily supporting freight traffic but holding potential for enhanced passenger services. The southern line to , approximately 140 km long, is fully electrified and utilizes electric multiple units for efficient operations, with travel times of about 1.5 hours and capacities supporting up to 500 passengers per train. The western extension to in operates as Line T2, a 112 km route that combines rail with temporary bus replacements on the Edessa-Florina segment due to ongoing upgrades, offering scenic access to areas like the Prespes lakes and ski centers. Partially electrified overall, with the and Idomeni segments benefiting from 25 kV AC overhead lines, the system's infrastructure includes upgraded signaling and ETCS compatibility on key sections to improve safety and interoperability. The recent €15 million expansion project, co-funded by the , introduces a new local branch serving seven stations—Sindos, Anchialos, Diavata, Kordelio, Eptanisos, Menemeni, and the New Thessaloniki Railway Station—with modern platforms, pedestrian bridges, and electrification enhancements to boost connectivity for industrial zones and university commuters, with full operations launching by late November 2025 following successful test runs. This hybrid service profile caters to both short-haul suburban travel and regional journeys, such as to Pieria beaches or border areas, promoting in a metro area larger than but less urbanized than . As of November 2025, restoration efforts in the network following the extensive damage inflicted by in September 2023, which severely impacted the section of the Larissa line, are progressing on schedule with a €450 million budget, with partial services reinstated but full operations and elimination of bus substitutions expected by 2026. This ongoing recovery, combined with the upcoming launch of the new western suburban extension, positions the system for enhanced cross-border potential, particularly via Idomeni, as upgrades align with interoperability goals for Balkan .

Patras Suburban Railway

The Patras Suburban Railway serves as a vital commuter link in the western , tailored to the transport needs of and its adjacent suburbs. The network encompasses two lines spanning approximately 30 km in total: one running from Kato Achaia to Agios Vassilios (Patras's central station), covering about 24 km, and the other from Agios Vassilios to , extending roughly 7 km. This setup prioritizes efficient local travel, connecting residential areas with employment centers and educational facilities in a modestly sized urban environment. Infrastructure on the lines combines diesel-operated segments with limited electrified portions, reflecting the setup where diesel multiple units, such as class 560 GTW trains, handle non-electrified tracks typical of the area. The terminus offers proximity to the Patras port, enabling seamless transfers to ferry services bound for Italian ports like and , as well as destinations including Kefalonia and . Operational since the early with a focus on daily suburban mobility, the service bypasses urban congestion to provide comfortable access for residents in this compact metropolitan zone. In 2025, timetable adjustments have enhanced service reliability, including the resumption of trains on the Bozaitika-Rio section effective November 10, alongside better alignment with regional bus routes for integrated travel options. These updates, including coordinated bus connections from stations like Kastellokampos to sites such as and the , promote multimodal commuting using a single ticket system.

Routes and Connections

Athens Area Lines

The Athens Area Lines of the Proastiakos network form the core of the suburban rail system in , linking the , central , key suburban junctions, and with efficient, electrified services operated by S.A. These lines facilitate daily commutes for residents, airport transfers for travelers, and connections to regional routes, with services running hourly during peak periods and integrating seamlessly with the and bus networks. As of September 2025, timetables were updated; check official site for current schedules. Line 1 operates between and , covering 47 km with both express and local variants to accommodate varying passenger needs. Key stops include for central city access and the ( Railway Center) junction for transfers to western and eastern branches. The full route from to the airport takes approximately 60 minutes, while the segment from central to the airport is about 40 minutes, making it a popular choice for airport connectivity. Line 2 provides a circular service from Doukissis Plakentias to and onward to , enhancing mobility in the eastern suburbs. This route interchanges with Metro Line 3 at Doukissis Plakentias, allowing seamless transfers for passengers from northern areas like Kifisia and . The service supports access without returning through central , reducing travel redundancy for suburban commuters. Line 3 extends from via SKA to Kiato, spanning 140 km as a vital extension with stops at major towns including . This line serves regional travel needs, connecting Attica's urban core to 's industrial and port facilities, with journey times from to Kiato averaging 1 hour 10 minutes to 1 hour 30 minutes depending on the service. Key intermediate stops include Agioi Anargyroi, Ano Liosia, , , and Agioi Theodoroi, enabling access to western Attica's communities. Line 4 runs from Ano Liosia via to , focusing on the industrial zone of western while providing airport connectivity. This route emphasizes frequent local stops for practical access to manufacturing and warehousing hubs like , integrating with broader network lines at for onward travel to or the airport. Line 5 functions as a service on the eastern suburban route from Pallini to , approximately 25 km, serving the northeastern suburbs with quick, direct trips. It caters to residential commuters in areas like Paiania and Koropi, offering an efficient alternative to amid growing urban development. Line A3 (Athens to Chalkida) extends eastward from Central to Chalkida, spanning approximately 80 km, with key stops including Oinoi, Thiva, and Chalkida. This electrified regional line serves commuters in and , with journey times of about 1 hour 20 minutes. Overall, these lines interconnect with the at stations such as Athens Central (for Metro Line 2), Doukissis Plakentias (Metro Line 3), and Neratziotissa (Metro Line 1), while bus interchanges occur at major stops like and the airport for regional OASA services. Direct airport access via Lines 1, 2, and 4 underscores the network's role in and , with integrated ticketing allowing use of the same fare across modes.

Thessaloniki Area Lines

The Thessaloniki area lines of the Proastiakos suburban railway network provide essential commuter and regional connectivity across , linking the urban center of with key towns, border regions, and inland areas. Operated by , these services depart from the central New Railway Station and emphasize efficient travel along partially electrified routes, serving daily commuters, , and cross-border passengers. The network comprises four primary lines, each tailored to specific geographic extensions while integrating with broader and bus systems. As of September 2025, timetables were updated; check official site for current schedules. Line T1 runs from to , spanning approximately 166 km and taking about 1.5 hours for the journey. Key intermediate stops include Platy, a junction for regional connections, and Paleofarsalos, near the Thessaly border, allowing access to coastal areas like Pieria beaches and urban centers in southern . This line operates with modern electric multiple units accommodating up to 500 passengers, highlighting its role in high-frequency suburban service along the electrified Athens- corridor. Line T2 extends westward to Florina, covering approximately 131 km in about 3 hours, incorporating diesel-operated segments due to incomplete electrification on these branches. The route passes through Edessa, with bus replacements occasionally used for the final section to support access to ski centers and lakeside areas. Diesel units like the ensure reliable operation on these non-electrified paths, serving rural and peripheral communities. Line T3 connects to over 71 km in roughly 1 hour, operating on the electrified eastern corridor toward East Macedonia and . Notable stops include Sidirokastro and other suburban points, providing intra-regional links for commuters traveling to industrial and agricultural zones east of the city. This line supports daily urban and short-haul trips, with services running multiple times daily to integrate with the metropolitan area's transport needs. Line T4 extends northward to the border at Idomeni, approximately 75 km, with diesel operation on non-electrified sections. This route facilitates border crossings and ties into international freight and passenger flows, aligning with Pan-European X. At Thessaloniki New Railway Station, these lines interconnect with regional trains to destinations like and Alexandroupoli, as well as local bus services for last-mile connectivity. The Idomeni extension further aligns with Pan-European X, enabling seamless EU-standard rail ties to and beyond, including ongoing upgrades for signaling and electrification to enhance cross-border efficiency.

Patras Area Lines

The Patras area lines of the Proastiakos network provide short-haul commuter services tailored to the port city's needs, linking urban centers, suburbs, and key transport hubs in a compact layout that emphasizes efficient local mobility. These routes primarily serve residents and workers in the Achaia region, facilitating daily travel to , , and activities. As of September 2025, timetables were updated; check official site for current schedules. The suburban line runs from Agios Vasileios to Kato Achaia, covering approximately 30 km via Patras, with stops including Agios Vasileios, Kastellokampos, Agyia, Bozaitika, Agios Andreas, Vrachneika, Paralia Patron, Kaminia, and Kato Achaia. Typical end-to-end trips last around 40 minutes. This line was extended to Kato Achaia in , expanding access to western suburbs previously served only by regional buses. Services incorporate bus feeders to the and Hospital from Kastellokampos, and are divided into zoned pricing from A1 to C for efficient local travel. Services run hourly during peak periods, operating daily from early morning to late evening and integrating with Achaia regional transport options to support broader in the . The line connects seamlessly to ferry services at port for inter-island and international travel, as well as local bus networks for onward journeys.

Electric Multiple Units

The Proastiakos service employs electric multiple units (EMUs) on its electrified lines to provide reliable commuter transport in urban and suburban areas. The fleet centers on the Mainline class, a family of regional EMUs optimized for high-frequency operations with flexible configurations and advanced digital controls for efficient . These units incorporate systems that recover up to 100% of braking energy in certain configurations, reducing operational costs and environmental impact on 25 kV AC electrified networks. Twenty Desiro Mainline units, each in a five-car formation, constitute the primary fleet, with a maximum operating speed of 160 km/h to facilitate swift travel. Ordered in the early and entering service from 2005, these EMUs were specifically adapted for infrastructure, featuring asynchronous motors delivering up to 3,840 kW of power for rapid acceleration on mixed-traffic lines. Their lightweight construction and aerodynamic design prioritize , with interiors supporting approximately 280 seats and additional standing space for peak-hour demand. These EMUs are primarily deployed on electrified routes in the network, including the high-speed link to and extensions to Kiato and Chalkis, as well as the suburban lines, where they handle daily passenger volumes exceeding tens of thousands. In operation, they often run as single sets or coupled pairs to optimize capacity during rush hours, contributing to the service's role as a key artery for metropolitan mobility. Maintenance for the Desiro fleet is based at the Agios Ioannis Depot in the area, which includes eight lines for EMU repairs, and the Depot with three dedicated lines for electrical servicing and overhauls. These facilities support comprehensive inspections, component replacements, and efficiency upgrades, ensuring compliance with safety standards and minimizing downtime for the aging but reliable units. Fleet enhancements are ongoing as of 2025 to integrate newer models for increased frequency and capacity on core lines like the Airport route.

Diesel Multiple Units

The diesel multiple units (DMUs) of the Proastiakos network primarily consist of 2/6 units on non-electrified lines, with 17 standard-gauge units (OSE class 560) configured as 2- or 3-car sets with diesel-hydraulic and a maximum speed of 120 km/h for Thessaloniki-area services, including extensions to on Line T2. Additionally, 12 metre-gauge units (OSE class 4500) serve the Patras suburban lines. These units were acquired in 2003 and entered service from 2004, providing flexible operation on routes with varying infrastructure standards. These DMUs are deployed on the suburban lines (metre-gauge) and extensions from (standard-gauge), including services to on Line , where they handle regional commuter demands in lower-density areas. Their design allows adaptability to single-track sections common in peripheral rail corridors, enabling efficient bidirectional running without dedicated passing loops in many locations. The services also utilize MAN 2000 (OSE class ) two-car DMUs, with around 22 units built in 2005-2006, offering similar diesel-hydraulic propulsion, 120 km/h speed, and capacity for about 180 passengers. In response to damage from in 2023, which affected rail infrastructure in and disrupted services, the DMUs underwent repairs to restore reliability, ensuring continued operation on affected extensions by late 2023. Plans for hybrid conversions of these units were proposed around 2023, with ongoing fleet renewal efforts as of 2025 to enhance and reduce emissions on non-electrified routes. With a of 150 to 250 passengers per unit depending on configuration, the 2/6 sets are well-suited for lower-density suburban and regional services, contrasting with the higher-speed electric multiple units used on electrified lines. The MAN 2000 units provide complementary on routes.

Fares and Ticketing

Pricing and Payment Methods

The Proastiakos operates a zonal structure tailored to each regional , ensuring affordability for daily commuters while accounting for distance and destination. In the Athens , single tickets for short zones begin at €1.20, escalating to €9 for direct services to Athens International Airport, reflecting integration with the broader public transport system. The Thessaloniki uses distance-based fares for suburban and regional trips. In , pricing emphasizes compact zones, with single tickets at €1.40 for basic A1, A, B, or C zones and up to €3 for multi-zone journeys such as A to C. Available ticket types cater to varying travel needs, including single-use tickets valid for one hour before and three hours after the scheduled departure, daily passes for unlimited rides within 24 hours, and monthly subscriptions via rechargeable smart cards that provide unlimited zonal access. Discounts are structured to support key demographics, offering up to 50% reductions for students on school-related trips, seniors aged 65 and over, large families, individuals with disabilities, and children aged 4–12, alongside 25% off for youth under 24. Children under four travel free without a reservation. These concessions apply across all networks and can be combined with early booking offers for additional savings up to 15%. Passengers can purchase tickets through multiple channels, including onboard sales at full price, automated vending machines at stations, and the for e-ticketing, which has been available since 2020 and supports contactless payments without any mandatory cashless policy. Validation is compulsory immediately upon boarding via platform validators or onboard machines to activate the ticket; unvalidated or missing tickets incur fines starting at €50, enforced by onboard inspectors. This system promotes compliance while facilitating seamless travel, with options for refunds or changes up to 10 minutes before departure at ticket offices.

Integration with Other Transport Modes

In the , Proastiakos services are integrated with the broader network operated by OASA, allowing passengers to use a single 90-minute priced at €1.20 for unlimited travel across buses, trolleybuses, trams, lines 1, 2, and 3 (up to Koropi station), and Proastiakos lines from Magoula to and Koropi. This unified ticketing system facilitates seamless interchanges within 90 minutes, promoting efficient multi-modal journeys without additional fares for transfers between these modes. For airport access, Proastiakos provides direct connections from to central stations, with a dedicated €9 , while fixed-rate from the airport to the city center offer a complementary option at €40 during daytime hours (5 a.m. to midnight), enabling travel plans that combine and road transport. In , Proastiakos suburban rail services, operated as regional lines by , connect with OASTH bus networks, with joint ticketing frameworks such as the ThessTicket and ThessCard systems introduced in late 2024 covering urban buses and the metro. These passes support intermodal travel, including regional connections to via Proastiakos trains, which take approximately 1.5 hours and accommodate up to 500 passengers per service, allowing users to bundle bus and rail for cost-effective trips across . Overall integration efforts in Thessaloniki emphasize intermodal coordination to incorporate rail into the bus-dominated system, as outlined in studies on harmonization. For the Patras area, Proastiakos lines link directly to the port facilities. Additionally, Achaia regional bus services connect with the suburban rail for local travel. As of 2025, enhancements to integration include the rollout of digital tools like the Tap2Ride system in for contactless payments across OASA modes including and buses, with smart tickets offering for Proastiakos. These platforms, complemented by third-party apps such as , enable unified multi-modal route planning and payments, covering Proastiakos alongside buses for more efficient regional travel.

Future Developments

Athens and Attica Extensions

The planned extensions of the Proastiakos network in and aim to accommodate urban growth by improving rail links to major ports and southern suburbs, enhancing commuter access and supporting in the region. These projects focus on expanding the existing suburban rail infrastructure to handle increased passenger volumes and integrate with other transport modes, such as the and coastal ports. Funding for several initiatives has been secured through Cohesion Funds and national budgets, with construction timelines aligned to minimize disruptions to current services. Upgrades to the Piraeus-SKA line, a key corridor connecting the to the Railway Center, include doubling the track to boost capacity for both passenger and freight trains. This enhancement will allow for more frequent services and higher throughput, addressing in one of the busiest segments of the network. The project is part of a broader initiative to create a double-track line from to , with completion anticipated by late 2026 or 2027. The -Koropi-Lavrio extension will add approximately 30 km of new track from the SKA through Koropi to the of , providing direct suburban rail service to southeastern and facilitating cargo movement from the port. Funding for this €380 million was secured in 2024 via EU and national sources, with construction scheduled to commence in 2026 following final preparatory works. Similarly, the SKA-Pallini-Rafina extension, spanning about 20 km and linking the area to the Rafina with intermediate stops, is advancing through environmental impact studies expected in 2025 to ensure . A tender for this line, featuring five new stations, attracted three bidders in 2022, indicating strong progress toward implementation. New stations at and are planned as part of these southern expansions, improving local access in densely populated coastal areas and tying into the broader urban rail ecosystem. These additions are coordinated with the progress of Line 4, where tunnel construction is projected to complete by 2026, enabling seamless intermodal connections and shared infrastructure benefits for Proastiakos services.

Northern Greece and Peloponnese Expansions

In , the Proastiakos network in the Thessaloniki area is undergoing significant expansion to improve regional connectivity and commuter services. A key development includes the launch of a new suburban rail line from 's New Railway Station to Sindos on November 19, 2025, following the completion of initial test runs in October 2025. This approximately 15-20 km extension will provide direct links to industrial and suburban zones northwest of the city, enhancing access for daily commuters and freight integration, with six new services in each direction daily at a of €1.00. Complementing this, a €15 million investment initiated in 2025 is supporting the broader modernization of the Thessaloniki suburban rail infrastructure, with a focus on safety upgrades, track improvements, and capacity enhancements. These efforts are part of Greece's national transport strategy to alleviate road congestion and promote sustainable mobility in the region's growing urban corridor. In the , expansions center on completing the full - corridor, which will establish a comprehensive Proastiakos service spanning roughly 200 km from through Kiato and to . The section from SKA (near ) to Kiato has been operational since 2007, with the Kiato- segment (about 37 km) entering service in 2020 as a double-track, electrified line. Ongoing construction from to , including upgrades to the southern sector around Kato Achagia, is progressing toward full integration by the late 2020s, with electrification targeted for completion by 2028 to enable higher speeds and more frequent services. A planned branch to from the area will further extend local access, supporting tourism and residential links. Cross-regional integration of the SKA-Corinth-Patras line is expected to drastically cut travel times, reducing the Athens-Patras journey to approximately 2 hours upon full completion, compared to over 3 hours currently by rail. This will connect the Attica region directly with Peloponnese hubs, fostering economic ties and reducing reliance on roadways. These projects are largely funded through EU mechanisms, including over €30 million from the Cohesion Fund allocated in 2023 for modernizing the Athens-Patras railway, which will shave an additional 20 minutes off journey times in that corridor. Post-2023 disbursements from the EU Recovery and Resilience Facility have supported preparatory works, with tenders for remaining contracts anticipated in 2025 to accelerate implementation. Overall, nearly €800 million in EU aid has been directed to Greek rail upgrades since 2023, prioritizing safety and efficiency in regional networks.

Electrification and Modernization Projects

The Proastiakos suburban rail network in is the focus of several electrification initiatives aimed at transitioning from to electric operations, improving , and increasing service speeds. A major involves the installation of 25 kV 50 Hz overhead along the Athens Airport–Patras railway, which currently features electrification from the airport to Kiato. The Kiato–Aigio segment, spanning approximately 27 km, is under construction through ERGOSE Contract 1511, with completion scheduled for January 2026 to enable full electric compatibility on this stretch. Further extensions toward are planned to achieve complete 25 kV electrification across the Patras lines by 2028, supporting higher-capacity electric services and reducing reliance on locomotives. In , the –Larrisa line, a core Proastiakos route, has been electrified since 2008 with 25 kV AC, allowing modern electric multiple units (EMUs) to operate between the cities. Modernization efforts, including track upgrades and signaling enhancements, are ongoing to boost reliability and capacity, with full completion targeted for as part of broader national rail corridor improvements. These upgrades align with EU-funded initiatives to standardize electrification across the –– axis, facilitating interoperable operations and faster suburban connections. Signaling modernization has gained urgency following the 2023 Tempe rail accident, prompting accelerated deployment of the (ERTMS) and (ETCS). currently operates ETCS Level 1 on select sections, but national reforms aim for full ERTMS/ETCS rollout on key lines, including Proastiakos routes, to enhance safety through automatic train protection and remote monitoring. The government committed to installing comprehensive remote train control systems by September 2025; however, as of November 2025, projects including a €90 million initiative for ETCS Level 1 and modern signaling on lines such as -Idomeni are being launched, with initial pilots focused on the area to test integration with existing suburban infrastructure. This includes restructuring the railway infrastructure manager to prioritize ETCS deployment on the –– corridor, addressing systemic vulnerabilities exposed by the incident. Fleet upgrades are central to these modernization efforts, with procuring new to replace aging diesel multiple units (DMUs) and expand electric operations. In 2025, a €360 million agreement with Italy's includes the acquisition of 15 new suburban trains to increase passenger capacity on Proastiakos lines, with delivery timelines to be defined in the revised contract. Plans also encompass trials of DMUs for non-electrified sections, supporting a phased transition to greener propulsion technologies. These projects contribute to broader sustainability objectives under the Green Deal, which seeks to reduce transport sector by 90% by 2050 compared to 1990 levels, with playing a pivotal role in modal shifts from road vehicles. In , modernization aligns with national commitments to cut overall GHG emissions by 58% by 2030, targeting a 30% reduction in -related emissions through and efficient fleet operations. funding, including €90 million for the central corridor, supports these green goals by prioritizing low-carbon infrastructure and energy-efficient upgrades.

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