In a bold leap toward sustainable rail transport, ScotRail has launched a pioneering trial, replacing conventional diesel with hydrotreated vegetable oil (HVO)—a renewable fuel derived from agricultural and food production waste. Describing the initiative as an “exciting step forward,” the operator sees this as a critical move in Scotland’s broader transition to greener railways.
The trial, which commenced on February 19, has tested one of ScotRail’s class 156 passenger trains (unit 156 436) by fueling it entirely with HVO instead of diesel. If deemed successful, this 12-week experiment could pave the way for HVO to serve as a short-term “transition fuel,” bridging the gap until fully carbon-neutral alternatives—such as green hydrogen—become commercially viable.
Unlike fossil-based diesel, HVO is a biodegradable and renewable fuel that can be used in existing diesel engines without requiring modifications. This makes it a practical and cost-effective solution for reducing emissions in the near term.
ScotRail reports that HVO can cut carbon emissions by up to 16% while enhancing air quality by nearly a third compared to standard diesel. It meets fire safety regulations, ensuring compliance with industry safety standards.
Poul Wend Hansen, ScotRail's head of sustainability, said: “This trial is an exciting step forward in our commitment to reducing the environmental impact of Scotland’s railways.
“HVO has the potential to significantly lower our carbon footprint while allowing us to continue using existing diesel trains more sustainably.
“We’re eager to see the results and assess how this fuel could be part of a greener future for rail travel.”
ScotRail has established a dedicated HVO fuel tank at its Corkerhill Depot in Glasgow to facilitate the trial. Weekly fuel deliveries ensure the continued operation of the class 156 train, which remains in active passenger service throughout the testing period.
The initiative is being carried out in collaboration with Angel Trains and Crown Oil, key partners in ScotRail’s mission to integrate sustainable fuel alternatives into its operations.
As Scotland strives to decarbonize its rail network, this trial represents more than just a test—it’s a stepping stone toward a cleaner, more sustainable future. Whether HVO will see widespread adoption hinges on the trial’s outcome, but one thing is certain: ScotRail actively seeks innovative ways to power its fleet with greener alternatives.
If successful, this could mark a significant shift in the rail industry’s approach to eco-friendly fuels, setting a precedent for other operators across the UK and beyond.
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