Renfe HVO Trial Puts Costa Verde Express on Greener Track

Renfe’s decision to trial renewable hydrotreated vegetable oil on the Costa Verde Express luxury tourist train is being viewed as a significant step toward cleaner, low-carbon rail tourism along Spain’s northern coast.

A Flagship Tourist Train as a Sustainability Testbed

The Costa Verde Express has long been one of Renfe’s showcase tourist services, tracing a six-day route between Bilbao and Santiago de Compostela with shorter itineraries linking Oviedo and Bilbao. The train’s classic rolling stock, panoramic lounge cars and emphasis on gastronomy have helped position it as a benchmark for slow, high-end rail travel through the so-called Green Spain.

Publicly available information on Renfe’s luxury tourist trains shows that the Costa Verde Express now sits alongside services such as El Transcantábrico Gran Lujo and Al Andalus in the operator’s premium portfolio. In sustainability reports, these trains are specifically identified as part of the group’s wider decarbonization drive, indicating that operational changes on one service can have wider implications for the whole segment.

Using the Costa Verde Express as a platform for alternative fuels allows Renfe to test technologies in a context where passenger volumes are relatively modest, yet visibility is high. The line’s non-electrified stretches and demanding topography along the Cantabrian coast also provide a realistic environment in which to evaluate performance, reliability and passenger experience under real-world conditions.

The new hydrotreated vegetable oil, or HVO, trial positions the train as a bridge between heritage-style luxury and evolving environmental expectations. By introducing lower-emission traction on an iconic service, the operator is attempting to show that comfort and climate responsibility can coexist on long-distance tourist rail.

From Freight Pilots to Tourist Services

Renfe’s 2023 and 2024 non-financial and sustainability disclosures describe an expanding program of renewable fuel experiments across its network. In freight, the company has already documented a major pilot on the Algeciras to Córdoba corridor, where locomotives ran on HVO produced from used cooking oils, cutting life-cycle carbon emissions compared with conventional diesel.

These earlier trials, carried out on non-electrified freight sections, provided baseline data on engine compatibility, maintenance requirements and supply logistics for second-generation biofuels. According to the same public documents, the renewable fuel can be used without modifying existing diesel engines and is designed to reduce carbon dioxide output over the full fuel life cycle, while also supporting circular-economy goals by valorizing waste oils.

Transferring this experience to tourist services such as the Costa Verde Express marks a new phase in Renfe’s decarbonization strategy. While freight operations offered large emission reductions in absolute terms, the high profile of luxury tourist trains creates a different type of impact by giving visibility to cleaner technologies among domestic and international travelers.

The Costa Verde Express HVO test is being interpreted by industry observers as a logical extension of the established freight pilots. The intention is to gather evidence on how renewable fuels behave in mixed operational profiles that include frequent stops, low-speed scenic sections and complex shunting movements typical of tourist itineraries.

Implications for Spain’s Tourism and Climate Goals

Spain has committed to significant cuts in transport emissions as part of its national climate strategy and wider European Union objectives. Rail travel already accounts for a relatively small share of the sector’s greenhouse gas output, particularly on electrified main lines powered by renewable electricity, but diesel-operated tourist and regional services remain an important challenge.

Introducing HVO on the Costa Verde Express aligns with efforts to reduce the carbon footprint of tourism, which is a major pillar of the Spanish economy. Northern coastal regions marketed under the Green Spain banner increasingly emphasize low-impact experiences, and rail-based itineraries are central to that positioning. A lower-emission traction option for luxury trains reinforces the message that visitors can explore coastal landscapes without relying on private cars or short-haul flights.

For destination regions in Galicia, Asturias, Cantabria and the Basque Country, a greener Costa Verde Express could also support local policy aims. Many municipalities along the route highlight their own climate plans and sustainable mobility initiatives; hosting a flagship train that operates on renewable fuel may be seen as complementary to those goals, while still drawing high-spending visitors to small towns and heritage sites.

Analysts of European transport policy note that such pilots help clarify where renewable liquid fuels best fit within wider decarbonization plans. While full electrification remains the long-term objective on many corridors, biofuels like HVO are increasingly being evaluated as an interim solution for non-electrified sections that carry important tourism or regional traffic.

Technical Challenges and Operational Considerations

Running a luxury tourist train on HVO involves more than simply changing the contents of the fuel tank. Renfe’s earlier corporate reporting on renewable fuels highlights the need to monitor engine performance, fuel consumption and maintenance cycles to confirm that the alternative fuel delivers promised emission cuts without compromising reliability.

On services like the Costa Verde Express, where timetables are interwoven with guided excursions, coach transfers and hotel partnerships, operational resilience is particularly important. Any technical issues can quickly cascade through a tightly programmed itinerary. The HVO trial is therefore expected to focus closely on how the fuel behaves under repeated start-stop conditions, steep gradients and variable loads associated with onboard services.

An additional consideration is fuel supply and storage along the route. HVO distribution for rail remains at an early stage, and ensuring consistent availability at depots and fueling points will be crucial if the trial is to progress to regular service. Industry coverage of earlier freight pilots in Spain has pointed to the role of energy partners in securing volumes of certified renewable fuel at competitive cost.

By experimenting first on limited tourist seasons, the operator can test procurement, storage and quality-control procedures at a manageable scale. The findings will be relevant not only for the Costa Verde Express but for any future expansion of renewable fuels to other non-electrified passenger or regional lines in Spain.

A Template for Future Low-Carbon Luxury Rail

The Costa Verde Express has already undergone significant transformation over its history, evolving from the former Transcantábrico Clásico into its current configuration and itinerary. The move to trial HVO represents another layer of reinvention, this time centered on climate performance rather than purely on comfort or design.

Observers of the European luxury rail market suggest that sustainability is becoming a differentiating factor, with travelers paying increasing attention to the environmental profile of high-end journeys. A successful renewable-fuel trial on the Costa Verde Express could give Renfe a marketing advantage and potentially influence competitors or partners elsewhere on the continent.

More broadly, the experiment underscores a shift in how tourist rail products are conceived. Rather than treating heritage-style trains as fixed artifacts, operators are starting to integrate them into broader sustainability narratives, from renewable traction and energy-efficient maintenance to certified tourism quality schemes that include environmental commitments.

If the HVO pilot on the Costa Verde Express proves technically and commercially viable, it may encourage similar trials on other luxury services in Spain and beyond. In that sense, the train’s journey along the Cantabrian coast could help chart a new route for low-carbon rail tourism across Europe.