Porto–Vigo rail link faces uncertainty as DMU lease nears end

The medium-term future of the Celta train between Porto and Vigo has been thrown into doubt as the diesel multiple units used on the cross-border service near the end of their leasing contract, raising questions over how Portugal’s CP and Spain’s Renfe will maintain rail links across the Minho corridor.

A leased diesel fleet at the heart of a strategic corridor

The Celta service, jointly operated by Comboios de Portugal (CP) and Spain’s Renfe, is currently worked by diesel multiple units of the 592 series that CP leases from the Spanish operator. Public financial documentation from both companies indicates that the existing lease arrangement runs until the end of 2025, with associated maintenance services included for the cross-border fleet.

The trains provide two daily services in each direction between Porto Campanhã and Vigo Guixar, stopping at Nine, Viana do Castelo and Valença on the Portuguese side. Promotional material from CP characterises the route as a key international connection, linking Porto and northern Portugal with Galicia along the Minho Line, which has been fully electrified in recent years.

Despite that electrification, the international service continues to rely on diesel equipment because the electrical systems of the two countries are not aligned and compatible bi-voltage rolling stock is not yet in place. As a result, the 592-series DMUs have become a strategic asset, allowing continuous operation across the border while long-term infrastructure and rolling-stock projects remain incomplete.

The diesel lease has already been prolonged once. Regional media coverage in Portugal has reported that CP extended the leasing of 18 diesel units from Renfe to bridge delays in electrification and fleet renewal, with costs scheduled into 2026, 2027 and a tail into 2028. However, those figures cover the broader diesel fleet and not just the Celta sets, adding to the complexity of understanding how long the current Porto–Vigo trains will remain available.

Contract timelines and an opaque renewal horizon

Recent transparency reports from Renfe’s leasing subsidiary refer explicitly to a contract with CP for series 592 trains that is due to run until 31 December 2025. The same documents outline expected revenue linked to this agreement but provide no clear indication of any automatic extension or replacement deal beyond that date.

On the Portuguese side, CP’s 2024 consolidated accounts refer to Renfe’s role in maintaining the leased diesel coaches and to ongoing investment programmes for new multiple units aimed at regional and urban services around Lisbon and Porto. However, there is no detailed public timeline specifying when new rolling stock suitable for international operation on the Porto–Vigo axis will become available.

Industry observers note that this creates a potential gap: the current leased fleet may cease to be available around the middle of the decade, while new equipment that can operate seamlessly under Portuguese and Spanish standards has not yet been introduced. Without an updated agreement or interim solution, the risk is that the train link could be reduced or replaced by road-based alternatives.

The lack of clarity contrasts with the strategic importance long attributed to the corridor. Policy and advocacy reports on Iberian rail connectivity have highlighted the Celta as both a symbol and a practical test case for cross-border regional rail, pointing out that it remains the only direct daytime passenger train linking northern Portugal with Galicia.

Infrastructure works add short-term disruption

In parallel with the contractual questions over rolling stock, passengers on the Celta route are already facing short-term uncertainty due to infrastructure projects in Galicia. Notices from both CP and Renfe earlier in 2026 announced periods during which parts of the Vigo–Valença section would be operated by replacement buses while engineering works proceed on the Spanish side.

CP has described these changes as temporary, emphasising that rail services continue to operate on the Portuguese section of the route, sometimes with different rolling stock than usual. Renfe has issued its own public advisories outlining modified patterns for services using the Minho line, including the cross-border trains to and from Porto, with segments of the journey shifted onto road transport.

These temporary arrangements illustrate how fragile the current service model can be. Any disruption to the availability of diesel multiple units, or to the infrastructure they use, quickly results in partial suspensions and mode changes. For regular cross-border commuters and tourists alike, the frequent adjustments reinforce perceptions of an unreliable connection.

Travel forums and passenger feedback collected online indicate that some travellers are increasingly defaulting to coach services between Porto and Vigo, which often offer higher frequencies and less complex transfers than the rail-and-bus combinations now seen during engineering works.

Ambitious high-speed plans, slow practical progress

The uncertainty around the DMU lease overlaps with longer-term ambitions for a high-speed rail corridor between Porto and Vigo. Planning documents and background material on the proposed high-speed line describe a future electrified, fast connection between Portugal’s second city and Galicia, intended to integrate into wider Iberian and European networks.

For now, these high-speed plans remain largely on paper, subject to multi-year planning, financing and construction timelines. Analyses of Portuguese and Spanish infrastructure strategies suggest that any fully built high-speed route is unlikely to be in service before the early to mid-2030s, leaving the existing Celta as the only rail option between the two cities for at least the rest of the decade.

This gap between long-term aspirations and present-day realities is central to the current debate. Electrification works on the Minho Line have been completed on the Portuguese side, but the absence of interoperable electric trains means the route still relies on leased diesel equipment that was originally designed decades ago for domestic Spanish services.

Transport policy organisations that track cross-border rail have repeatedly argued that relying on stopgap leases and life-extended diesel trains is incompatible with broader European decarbonisation goals. However, until funding and procurement decisions are aligned on both sides of the border, the Celta is dependent on precisely this type of interim solution.

What is at stake for passengers and regional mobility

The potential end of CP’s DMU leasing arrangement with Renfe raises immediate practical questions for passengers. If no replacement rolling stock is ready by the time the contract expires, operators may face the choice of trimming frequencies, introducing more extensive bus substitutions, or negotiating an additional extension to the lease on ageing diesel trains.

For cross-border workers, students and tourists, the continuity of a through rail connection is more than symbolic. The Celta offers a predictable, if limited, timetable that connects directly into local and intercity services at both Porto Campanhã and Vigo Guixar, helping to knit together labour markets and tourism flows across the border.

Regional authorities and business groups in northern Portugal and Galicia have previously underlined the economic benefits of enhanced rail connectivity. While those arguments often focus on future high-speed or upgraded services, they implicitly depend on maintaining at least the current level of cross-border rail in the interim period.

As the leasing horizon for the diesel multiple units comes into view, the Porto–Vigo corridor sits at a crossroads. Decisions taken over the next two years on rolling stock, interim contracts and the pace of infrastructure upgrades will determine whether the Minho rail link can evolve into a more robust, electrified connection, or whether passengers will see a patchwork of temporary fixes and growing reliance on road transport.