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Interregio-Express

The Interregio-Express (IRE) was a category of regional express train services operated by Deutsche Bahn in Germany, providing direct interregional connections between cities and regional centers while skipping smaller stations to offer faster travel than local services. Positioned within Deutsche Bahn's local and regional transport network, the IRE bridged the gap between the shorter-haul Regional-Express (RE) trains, which focus on quick local links, and the national InterCity (IC) long-distance services, delivering efficient mid-range journeys without mandatory seat reservations. These trains emerged in the early 2000s as part of a restructuring of passenger rail offerings, following the reclassification of former InterRegio routes—previously a semi-long-distance category—from unsubsidized commercial operations to the subsidized regional framework managed by Germany's federal states. IRE services operated primarily in select federal states, including Baden-Württemberg, Bavaria, Saxony, Saxony-Anhalt, and Berlin (parts of eastern Germany), with notable routes such as the Hamburg–Berlin line designed to counter low-cost bus alternatives. They utilized modern rolling stock equipped with comfortable seating, dedicated luggage areas, onboard monitors for journey updates, and accessibility features, though amenities remained more limited than on high-speed InterCity Express (ICE) trains. Funded through state subsidies, IRE trains were integrated into affordable regional ticketing options, including the nationwide , which allows unlimited travel across local and regional services for a flat monthly fee. With the December 2024 timetable change, the IRE category was largely discontinued as of 2025, with operations reclassified under other regional services to enhance network efficiency. These services had played a vital role in supporting connectivity in underserved interregional corridors, emphasizing reliability and integration with broader public transport networks.

Overview

Definition and Purpose

The Interregio-Express (IRE) is a category of regional train service operated by Deutsche Bahn Regio (DB Regio) in Germany, introduced in 2001 as part of the local public transport system. Although classified under Schienenpersonennahverkehr (SPNV), it targets longer regional distances, typically 100–300 km, connecting mid-sized cities and regional hubs with fewer stops than standard Regional-Express (RE) services. The primary purpose of the IRE is to offer faster, direct links between regional centers, minimizing transfers and enhancing efficiency for commuters and travelers over medium distances. Unlike national long-distance services such as (IC) or (ICE), which rely on federal funding for high-speed operations, IRE services are financed through Regionalisierungsmittel—federal allocations to the states for contracts—ensuring integration with local transport networks. This funding model supports operations on a cost-covering basis, where bids for and fulfills contracts with state transport authorities to maintain service quality without premium pricing. Key characteristics include no mandatory seat reservations, allowing flexible boarding similar to other regional trains, and the absence of onboard bistro or dining services, keeping costs aligned with regional standards. Tickets from local transport associations (Verkehrsverbünde), such as the Verkehrsverbund Stuttgart or Nahverkehrsverbund Baden-Württemberg, are fully valid, promoting seamless integration with buses, trams, and S-Bahn networks. Operated via regional contracts, these services distinguish themselves from subsidized long-distance or premium options by prioritizing reliability over luxury amenities. As of 2025, IRE services continue primarily in Saxony and Saxony-Anhalt, following the phasing out of the branding in December 2024 in states such as Baden-Württemberg and Bavaria, where services were reclassified as Regional-Express for uniformity.

Distinctions from Other Services

The Interregio-Express (IRE) is classified as a regional service within Germany's local public transport (Nahverkehr) framework, distinguishing it from long-distance categories like InterCity (IC) and EuroCity (EC) trains, which fall under national funding and operate as premium services. IRE routes are subsidized by regional authorities and accept local tickets, including the Deutschland-Ticket valid since its nationwide introduction on May 1, 2023, whereas IC and EC require separate long-distance fares often exceeding €50 for similar distances. Additionally, IRE trains do not mandate seat reservations and omit upscale amenities such as dining cars or first-class sections typical of IC and EC services. Operationally, IRE services emphasize regional connectivity with more frequent stops at intermediate stations than IC and EC, which prioritize major hubs and achieve speeds up to 200 km/h on dedicated tracks; in contrast, IRE trains cap at 160 km/h and integrate into mixed regional corridors without high-speed priority. This results in longer travel times for IRE on overlapping routes—for instance, an IRE from Berlin to Hamburg might take over four hours with multiple halts, compared to under three hours on an IC. The IRE's design avoids the international focus of EC trains, which often cross borders with coordinated timetables among multiple operators. Relative to the Regional-Express (RE), the IRE covers extended inter-regional distances with streamlined stopping patterns, enabling higher average speeds while remaining part of the regional network eligible for the same fares; however, the distinction has blurred in practice, as both services share similar equipment and integration goals. Unlike the Regionalbahn (RB), which stops at virtually every station for comprehensive local coverage, or the S-Bahn's high-frequency urban loops limited to metropolitan areas, the IRE targets cross-regional journeys beyond commuter scopes, often leveraging upgraded lines for reliability. As an evolution from the discontinued Interregio (IR) predecessor—a semi-fast category blending regional and long-distance elements—the IRE focuses exclusively on express regional operations with fewer, more strategic stops to enhance efficiency without IR's former long-haul ambitions. Special IRE variants, such as the IRE-Sprinter on routes like to , further minimize stops—bypassing several intermediate stations—to optimize travel times while preserving regional ticketing eligibility and Nahverkehr policy alignment. This hybrid positioning under local transport regulations underscores the IRE's role in providing affordable inter-regional links without the premiums or infrastructure demands of national services.

History

Introduction and Early Development

The Interregio-Express (IRE) emerged as a key component of Deutsche Bahn's (DB) efforts to restructure regional rail services following in 1990. The 1994 Bahnreform merged the and into DB AG, aiming to modernize the network and address connectivity gaps in regional areas that had persisted since the introduction of the commercial service in 1988. This reform shifted focus toward subsidized regional transport to fill voids left by long-distance services, responding to the EU's initial rail liberalization directive (91/440/EEC), which promoted and competition in international rail services. A pivotal policy driver was the Regionalisierungsgesetz of 1996, which decentralized responsibility for regional passenger rail to Germany's federal states (Länder), allocating annual funding—approximately €7 billion by the early 2000s—from the federal budget to support public service obligations. In response, DB developed the IRE as a subsidized express regional service, distinct from long-distance InterCity (IC) trains by requiring no seat reservations and emphasizing connectivity between medium-sized cities. The service officially launched on June 10, 2001, under DB Regio (initially coordinated with DB Fernverkehr), by rebranding and transitioning select former Interregio lines into the regional framework to maintain express speeds without commercial viability pressures. Initial operations focused on southern Germany, including Baden-Württemberg, where state contracts funded enhanced services like those in the Rhein-Neckar area. Early implementation faced challenges in integrating IRE into DB's hierarchical structure, where regional services competed for infrastructure slots. DB Regio inherited rolling stock from prior Interregio operations, notably class 611 tilting trains, which enabled higher speeds on curvy routes but required adaptations for regional standards; in 2001, investments exceeded €435 million for modern diesel and electric multiple units to support rollout. Debut services marked a milestone, boosting regional train-kilometers by about 20% from pre-reform levels, primarily through state-financed contracts that ensured hourly or bi-hourly frequencies on key corridors.

Expansion and Peak Operations

Following the abolition of the commercial Interregio long-distance trains starting in 2000, Deutsche Bahn shifted such services to its regional portfolio under DB Regio, aligning them with subsidized regional operations to better integrate with local transport networks. This transition supported the broader regionalization of passenger rail in Germany, where states assumed funding responsibilities, leading to a nearly 20% increase in regional train-kilometers from 1996 to 2014, reaching 659 million annually by that year. Passenger-kilometers in regional services, encompassing Interregio-Express (IRE) routes, grew by 48% over the same period, reflecting expanded coverage and higher demand on key corridors. The IRE saw notable in the mid- through the , with new lines introduced to serve inter-regional connections in states like , , and . For instance, the Franken-Sachsen-Express IRE linking and via and operated as a high-capacity regional service by the late , providing hourly frequencies on major segments to enhance connectivity between eastern and . In northern regions, the eigenwirtschaftlich (self-financed) IRE between and launched in April 2014, offering a budget-friendly alternative to long-distance services with journey times around 3.5 hours and fares starting at €19.90, which helped capture additional ridership on this busy corridor without state subsidies. Peak operations occurred around 2015–2020, when IRE services achieved dense coverage on principal axes, including up to hourly departures in Saxony and Brandenburg, contributing to overall regional punctuality rates of approximately 90% for DB Regio in the late 2010s. The network's maturity was evident in Baden-Württemberg, where state contracts sustained strong performance until 2024, with expansions like the IRE on the high-speed Wendlingen–Ulm line starting December 2022, enabling speeds up to 200 km/h and new stops at intermediate stations to boost accessibility. A key milestone came with the introduction of the Deutschland-Ticket in May 2023, valid on all IRE routes as part of regional public transport, which drove a 5.7% rise in DB Regio's total ridership to 1,232 million passengers that year by making inter-regional travel more affordable nationwide.

Decline and Current Status

The decline of the Interregio-Express (IRE) services began in earnest from 2020, driven primarily by the COVID-19 pandemic, which led to a sharp reduction in passenger demand across European rail networks, with EU passenger-kilometers dropping by approximately 48% in 2020 compared to pre-pandemic levels. In Germany, Deutsche Bahn (DB) suspended or scaled back numerous regional services, including the prominent IRE line between Hamburg and Berlin, as low ridership made operations unsustainable; this route, operated by DB Regio AG, was effectively discontinued by late 2020 amid pandemic-related restrictions and economic pressures. The pandemic's effects lingered into 2021 and 2022, exacerbating existing challenges such as rising operational costs and infrastructure bottlenecks, with DB reporting persistent overloads on aging tracks that contributed to delays and higher maintenance expenses. Policy decisions further accelerated the contraction, as regional authorities sought to simplify service classifications amid fiscal constraints. A key example occurred in Baden-Württemberg, where on November 29, 2024, the state transport ministry announced the full phase-out of IRE branding effective December 15, 2024, reclassifying all such trains as Regional-Express (RE) services due to their lack of distinct operational or passenger relevance compared to standard RE lines. This move, which involved no changes to schedules or stops, aligned with broader DB restructuring efforts outlined in its 2025 interim report, which highlighted infrastructure overloads and the need for streamlined regional models to improve efficiency and comply with EU rail directives emphasizing integrated public service obligations (PSO) for cross-border and domestic connectivity. As of 2025, IRE operations have been reduced to a single primary service: the Kulturzug, a cultural train running from Berlin-Lichtenberg to Główny in , operating Fridays, Saturdays, and Sundays until December 28, 2025, under the IRE designation (e.g., IRE 5463). This cross-border route, which includes onboard cultural events, represents the last vestige of the IRE network, contrasting sharply with its pre-2020 peak when services spanned multiple states including , , and . The overall impact has been a loss of approximately 90% of the IRE network since its height. Recent reports indicate the Kulturzug is slated for discontinuation after its 2025 season due to high operating costs and insufficient numbers, potentially leading to its absorption into standard RE or international / categories. This reflects DB's ongoing on cost-cutting and through 2027, prioritizing integrated regional under frameworks to address overloads and enhance overall network resilience.

Routes

Current and Special Routes

As of 2025, the Interregio-Express (IRE) operates primarily through a single special cross-border route known as the Kulturzug, connecting Berlin-Lichtenberg in Germany to Wrocław Główny in Poland, covering approximately 280 kilometers. This service, branded as IRE lines such as 5461, 5462, and 5463, emphasizes cultural exchange with onboard programs including readings, concerts, and theater performances in a dedicated wagon. Launched on April 11, 2025, in its tenth season following the broader phase-out of IRE designations in regions like Baden-Württemberg due to the December 2024 timetable changes, it maintains the IRE branding for historical continuity as a regional express. The route operates on Fridays, Saturdays, and Sundays through December 28, 2025, with a frequency of up to three trains per weekend, though specific dates vary and some trips lack the full cultural program. Key intermediate stops include Berlin Ostkreuz, Cottbus Hauptbahnhof, Weißwasser, and several Polish stations such as Węgliniec, Bolesławiec, Chojnów, and Legnica, providing bilingual (German-Polish) announcements and service. The journey typically takes about 4.5 hours, integrating seamlessly with Polish rail operator PKP Intercity for cross-border operations. Special aspects of the Kulturzug include its event-driven ridership, which peaks during festivals and cultural happenings in , such as music events or exhibitions, without mandatory reservations—though optional seat bookings cost 5.50 euros. Tickets are eligible under regional fare schemes like the Deutschland-Ticket and can be purchased via or Polish platforms like Koleo.pl for 27 euros one-way, making it accessible for cultural travelers. This IRE service uses double-deck regional cars for comfort on the route. In 2025, the Kulturzug represents the sole active IRE-designated operation in Germany, a stark reduction from the pre-2024 network spanning thousands of kilometers across multiple states. However, it is scheduled to be discontinued after December 28, 2025, due to high operational costs and insufficient ridership.

Former Permanent Routes

The Interregio-Express (IRE) operated several permanent routes in southern Germany, particularly in Baden-Württemberg, from the service's launch in 2001 until the timetable change in December 2024, when all such lines were reclassified as Regional-Express (RE) services without alterations to their operational patterns or frequencies. This reclassification aligned the services with the nationwide RE designation to standardize regional rail categories, as decided by the Baden-Württemberg Ministry of Transport. Key examples included the IRE between Karlsruhe and Stuttgart, spanning approximately 100 km and running hourly to connect major urban and industrial centers in the region. Similar long-term operations covered the Ulm–Aalen line, about 80 km in length with services every two hours, and the Stuttgart–Aulendorf route, which linked the state capital to rural areas in the Swabian Jura over roughly 90 km. In northern and eastern Germany, permanent IRE routes were introduced later but faced earlier discontinuations due to factors such as low ridership and economic viability. The Hamburg–Berlin line, covering 280 km with services every two hours, operated from 2014 until its permanent cancellation in October 2021, primarily attributed to reduced passenger numbers amid the COVID-19 pandemic and associated operational costs. Likewise, the Nürnberg–Dresden route, known as the Franconia-Saxony Express and spanning around 250 km, functioned as an IRE from 2006 to 2013 before reverting to lower-category regional services amid shifts in long-distance offerings. The Berlin–Magdeburg connection, approximately 150 km long, ran as a trial IRE from December 2010 to December 2012, after which it was discontinued following a two-year evaluation that deemed it unprofitable. At its peak, the IRE network encompassed 15 to 20 such continuous lines across Germany, serving a total of roughly 2,000 km and facilitating travel between industrial hubs, urban centers, and regional destinations. These routes emphasized direct, limited-stop services to bridge gaps left by declining Interregio long-distance trains, though many ended due to state-specific decisions on funding, ridership trends, and integration into broader RE frameworks.

Temporary and Discontinued Routes

Several temporary Interregio-Express (IRE) routes were introduced to address seasonal tourism demands or specific events, often operating on a limited schedule before being discontinued. For instance, a seasonal IRE service ran between Berlin Südkreuz and Bad Schandau via Dresden and the Elbe Valley from May 24 to September 20, 2014, providing weekend connections to the Saxon Switzerland region for recreational travel; this eigenwirtschaftlich (self-financed) route consisted of one train pair per Saturday and was not extended beyond the summer period. Event-based expansions also utilized the IRE category during major occasions, such as additional shuttles for the FIFA World Cup 2006, where Deutsche Bahn deployed over 250 special long-distance and regional trains, including IRE supplements on key routes like Dortmund to München to accommodate fan travel, though these were short-term and ceased after the tournament. In response to the COVID-19 pandemic, temporary IRE services were reinstated or expanded in regions like Saxony during recovery phases from 2022 to 2023 to support increased regional mobility as restrictions eased, but these were phased out as demand stabilized. Early discontinued IRE routes often resulted from low ridership or shifts in network priorities. The IRE 25 between and , introduced as a two-year in 2010 with two daily pairs on weekdays and no intermediate stops, was terminated on December 10, 2012, due to insufficient passenger numbers despite initial promotion as an express link. Similarly, the Franken-Sachsen-Express IRE from Nürnberg to , operating from 2006 to December 15, 2013, was discontinued and reclassified as Regional-Express services following regional changes that reassigned responsibilities to state-funded operations. The IRE Hamburg–Berlin route, launched on April 14, 2014, as a competitive to long-distance buses with hourly services via and , faced multiple postponements during the and was permanently discontinued in October 2021 after temporary suspensions, citing operational challenges and reduced viability. Discontinuation patterns for IRE routes pre-2020 frequently involved competition from (IC) services or upgraded Regional-Express () lines, leading to the end of approximately 5-10 such routes as operators prioritized higher-capacity or subsidized . By 2024, all remaining non-special IRE routes in , including the – Sprinter, were discontinued as a distinct category on December 15, 2024, with services rebranded under the unified Regional-Express designation to standardize regional offerings; for example, IRE 6 (–) became RE 6, and IRE 17b (–Mühlacker) was integrated into RE 71 (–Mühlacker). This shift affected an estimated total of temporary and discontinued mileage around 500 km across various states, reflecting broader consolidation in Germany's rail network.

Operations

Scheduling and Network Integration

Interregio-Express (IRE) trains operate within Deutsche Bahn's (DB) integrated regular interval timetable, known as the Integrierter Taktfahrplan, which coordinates services across regional and long-distance networks to facilitate seamless connections. This system ensures that IRE services align with Regional-Express (RE) and Regionalbahn (RB) trains, providing feeder links for passengers traveling to and from smaller stations, while journey times on IRE routes typically range from 1 to 4 hours depending on distance and stops. IRE trains share infrastructure with InterCity (IC) services but generally receive lower operational priority, allowing IC trains to overtake where necessary to maintain their schedules. Cross-border coordination is a key aspect of IRE integration, particularly with neighboring networks like Poland's PKP Intercity. For instance, the Kulturzug service, operated as an IRE from Berlin to Wrocław, exemplifies this through synchronized timetables that enable direct connections without customs delays, running weekly on weekends since April 2025 with a journey time of approximately 4.5 hours. Scheduling frequencies for IRE services vary by region and demand, often every 1 to 2 hours on principal lines to balance capacity and efficiency. In the Stuttgart area, pre-2024 operations included near-hourly IRE services on select routes, such as IRE 1, to support peak commuter flows, though post-COVID adjustments led to reductions in some frequencies amid lower ridership and network constraints. By 2025, certain special services like the Kulturzug maintained consistent weekend operations, but overall DB network punctuality challenges— with 34.7% of long-distance trains delayed in the first half of the year—have impacted IRE reliability due to shared tracks and cascading delays. IRE trains utilize regional infrastructure capable of speeds up to 160 km/h, focusing on upgraded conventional lines rather than dedicated high-speed corridors reserved for services, which optimizes costs while ensuring compatibility with the broader network. This setup allows for timed arrivals at major hubs like and , where IRE schedules are designed to coincide with RE/RB departures, minimizing transfer times to under 10 minutes during peak periods and enhancing overall connectivity.

Ticketing, Fares, and Passenger Services

Tickets for the Interregio-Express (IRE) are integrated into Germany's regional public transport system, allowing passengers to use local and regional tickets issued by transport associations such as the Verkehrsverbund Berlin-Brandenburg (VBB) or Verkehrsverbund Rhein-Sieg (VRS) for journeys within their respective zones. The nationwide Deutschland-Ticket, introduced in May 2023 at an initial price of €49 per month (rising to €58 in 2025, with a further increase to €63 planned for January 2026), is valid on all IRE services as part of local and regional rail operations, providing unlimited travel without additional supplements. Single tickets for IRE routes typically range from €20 to €50 depending on distance and zones covered, with no mandatory reservations or extra fees required, distinguishing IRE from InterCity (IC) services that often involve reservation costs. The fare structure for IRE follows regional pricing based on tariff zones defined by local transport authorities, avoiding long-distance surcharges that apply to national services like ICE or IC trains. Discounts are available for youth (under 27) and seniors (over 60) through Deutsche Bahn's BahnCard program or via the DB Navigator app, which offers up to 50% reductions on standard fares and promotes flexible booking options. IRE tickets remain valid according to the integrated timetable, ensuring seamless connections with other regional services without time restrictions beyond the ticket's validity period. Passenger services on IRE trains emphasize basic functionality suited to regional travel, including spaces for bicycles in designated areas without the need for advance reservations on most services. complies with 1300/2014, featuring dedicated spaces, adapted toilets, and low-floor entry on compliant , with providing assistance via its Centre for boarding and alighting. access is available on select IRE routes but was limited prior to 2024 expansions; vending machines offer snacks and drinks, though no onboard dining or bistro services are provided. The onboard experience features comfortable 2+2 seating arrangements in second class, with 2+1 in first class where available, and digital information systems displaying route updates and announcements in multiple languages on equipped trains. However, passengers have reported overcrowding during peak hours, leading to standing room only on popular routes despite efforts to increase capacity. In 2025, special IRE operations like the Kulturzug service between Berlin and Wrocław bundle cultural event access with standard regional fares starting at €27 one-way, enhancing the travel experience without altering base pricing structures. Accessibility features on IRE routes align with Bundesvereinigung Verkehr standards, through ongoing fleet upgrades.

Rolling Stock

Primary and Current Vehicles

The primary rolling stock for Interregio-Express (IRE) services in 2025 consists of DB Baureihe 646 diesel multiple units, known as Stadler GTW 2/6 articulated railcars, exclusively deployed on the Kulturzug route linking Berlin and Wrocław. These two-car units, operated by DB Regio, feature air conditioning, low-floor access for barrier-free boarding, and compliance with cross-border electrification and signaling standards for operation in both Germany and Poland. With a top speed of 120 km/h and a passenger capacity of approximately 200 (including standing room), they support the service's focus on cultural events while navigating mixed electrified and unelectrified track sections. Maintenance for the Baureihe 646 fleet is handled by DB Regio facilities in the Berlin-Brandenburg region, ensuring reliability for weekend operations that continued from pre-2024 schedules. In line with Deutsche Bahn's 2025 sustainability initiatives, these diesel units incorporate fuel efficiency measures, including the phased adoption of biofuels to reduce emissions across regional services. For the international Kulturzug, vehicles include bilingual German-Polish signage and onboard announcements to enhance accessibility for cross-border passengers. DB Regio leases and manages a limited pool of these units from its regional fleet to meet demand for the seasonal service, typically deploying one or two sets per weekend trip. The service is scheduled to run until December 28, 2025, after which it is planned to conclude.

Historical and Phased-Out Fleet

The Interregio-Express (IRE) services, introduced in 2001, initially relied on tilting diesel multiple units (DMUs) to navigate non-electrified and winding routes in southern Germany, particularly in Baden-Württemberg. The primary early fleet consisted of the DB Class 611, a two-car tilting DMU developed by Adtranz and entering service between 1996 and 1998. These 50 units were designed for speeds up to 160 km/h on curvy lines, serving routes such as IRE lines from Lindau to Stuttgart and Ulm to Basel, where they provided faster travel times without extensive infrastructure upgrades. However, the Class 611 suffered from significant reliability issues, including frequent failures in the tilting mechanism, which led to operational disruptions and safety concerns. In 2004, axle cracks and other defects prompted the deactivation of the tilting technology, reducing their effective speed and utility. By April 2018, they were largely replaced on key IRE routes like Ulm–Basel by newer units, with only sporadic substitute use thereafter. The planned end of regular service came in June 2019, and the entire class was fully retired by 2020 due to age, accumulated maintenance costs, and stricter emissions regulations under EU environmental standards. During the peak operational period from 2010 to 2024, the IRE fleet expanded to include the DB Class 612 RegioSwinger, a two-car tilting DMU produced by Adtranz (later Bombardier) from 1998 to 2003, with approximately 192 units built for high-capacity regional services on unelectrified tracks. These diesel-powered trains, capable of 160 km/h with active tilting, became the most common IRE vehicle, deployed across southern and eastern routes for their ability to couple into longer formations and handle demanding schedules. Regional variations emerged, with diesel-focused Class 612 sets (including the diesel variant 612.2) prevalent in eastern Germany for non-electrified lines, while electric double-deck configurations dominated in Baden-Württemberg. The latter typically involved Class 146 or 147 electric locomotives hauling Doppelstockwagen (double-deck coaches), providing higher passenger capacity on electrified corridors like those in the Stuttgart area. The Class 612 also faced reliability challenges, mirroring those of the 611. Axle cracks discovered in 2004 necessitated shorter inspection intervals and the temporary suspension of tilting operations, while further defects in 2009 and 2015 led to legal action against the manufacturer and ongoing limitations. In 2015, electric multiple units (EMUs) were introduced for shorter IRE lines, marking a shift toward more modular, low-floor designs with improved ; - or four-car sets, first rolled out in Germany around that time, supplemented the aging tilting fleet on regional routes. Maintenance for the IRE was centralized at facilities, where upgrades between 2018 and 2022 focused on enhancing accessibility features, such as low-floor entrances and spaces, to meet evolving needs. Post-2024, the IRE fleet underwent significant phasing out and reassignment, driven by EU green mobility goals emphasizing electrification and reduced emissions. The diesel-heavy Class 611 was completely withdrawn, while most Class 612 units were repurposed for Regional-Express (RE) services or sold abroad, such as eight sets to Croatia. Double-deck electric formations with Class 146/147 locomotives saw partial retirement, with surviving units shifted to RE duties amid a broader transition to hybrid and fully electric vehicles. The total IRE fleet size peaked around 300 units during this era, reflecting expanded network demands before the sustainability-driven consolidations.

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