Hydrogen trains: Deutsche Bahn pushes rapid refueling

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Germany’s Deutsche Bahn is advancing its H2goesRail program, pairing a new-generation hydrogen train with rapid refueling infrastructure designed to rival the tight turnarounds of diesel services on non-electrified lines.

From pilot concept to system-wide experiment

Publicly available project information shows that Deutsche Bahn, through its energy subsidiary DB Energie and infrastructure arm DB InfraGO, is testing hydrogen as a complete rail system rather than a stand-alone vehicle technology. The centerpiece is Siemens Mobility’s Mireo Plus H multiple unit, developed under the H2goesRail joint project to operate regional services where catenary is absent or difficult to install.

According to technical descriptions of the program, the Mireo Plus H combines fuel cells and lithium-ion batteries to deliver performance comparable to existing electric regional trains. The two-car variant is reported to have a range of up to roughly 800 kilometers, extending to around 1,000 kilometers for a three-car version, with a maximum speed of 160 kilometers per hour. The aim is to offer mainline-capable hydrogen traction that can slot into existing timetables without compromising speed or acceleration.

In trial operations, the hydrogen train is being deployed on non-electrified routes in southwest Germany as a replacement for diesel multiple units. Published project data indicate that substituting a single diesel set with the hydrogen train on one regional corridor can avoid hundreds of tons of carbon dioxide emissions per year when the hydrogen is produced from renewable electricity.

The trials are framed as a blueprint for broader rollout rather than a one-off demonstration. Documentation from Deutsche Bahn and Siemens highlights that the program is designed to test vehicle technology, fueling logistics, maintenance processes and passenger operations together as an integrated package.

Rapid refueling designed to mirror diesel operations

A key innovation of H2goesRail lies not in the train itself but in the way hydrogen is supplied and dispensed. Deutsche Bahn has developed a compact hydrogen refueling solution that is intended to refuel the Mireo Plus H in a time window comparable to refueling a diesel multiple unit, allowing the train to be turned around during regular layovers without additional timetable padding.

Technical briefings describe a multi-stage process in which green hydrogen is produced by electrolysis at or near a maintenance facility using renewable electricity from the rail power grid. The gas is then compressed, stored and cooled before being transferred to a mobile or semi-mobile refueling unit that can be positioned alongside the train. The interface between storage trailer and train is engineered to deliver hydrogen at high flow rates while maintaining consistent temperature to protect on-board tanks.

Deutsche Bahn’s public material notes that the rapid-refueling concept is intended to service tightly scheduled local trains that call at depots or termini only briefly between trips. The system is designed so a hydrogen multiple unit can be fully refueled within the same time window typically allocated to refueling and basic checks on a diesel set, making it possible to integrate hydrogen traction into existing duty diagrams.

The refueling solution is also being positioned as modular. The mobile configuration allows the equipment to be relocated to other non-electrified lines once initial trials conclude, supporting further pilots without the need to immediately commit to permanent fixed fueling terminals at every site.

DB Energie’s role in building hydrogen rail infrastructure

DB Energie, the energy business within Deutsche Bahn, is using the H2goesRail program to test how hydrogen production and distribution could fit into the group’s broader energy strategy. Company reporting outlines an energy network that already includes a dedicated traction power grid, substations and a growing portfolio of renewable electricity contracts for rail operations across Germany.

Within this framework, hydrogen is treated as an additional energy carrier for routes where full overhead electrification is unlikely to be economically viable in the medium term. The prototype refueling station in the southwest German city of Tübingen, built for the pilot, uses green electricity from the rail grid to produce hydrogen on site via electrolysis. This approach reduces the need to truck in hydrogen from distant industrial facilities.

Regulatory filings and annual reports indicate that DB Energie has been working with Germany’s Federal Network Agency on how hydrogen rail infrastructure should be classified and regulated, particularly regarding access and pricing for refueling facilities. While the pilot project focuses on Deutsche Bahn’s own operations, the emerging framework is expected to influence whether and how other passenger and freight operators can eventually access similar hydrogen infrastructure on fair terms.

For DB Energie, the hydrogen rail project sits alongside investments in battery charging infrastructure and further electrification, reflecting a multi-technology path toward phasing out conventional diesel traction on the network over the coming decades.

Implications for travelers on regional lines

For passengers, the most immediate change associated with the hydrogen trials is expected to be quieter and cleaner operations on regional routes that still rely heavily on diesel. Technical comparisons suggest that fuel cell trains can reduce local air pollutants and perceived noise levels at stations and in adjacent communities, particularly during acceleration and idling.

Because the refueling concept has been designed around rapid turnaround, published material indicates that timetable structures should remain largely unchanged during the pilot phase. The objective is for passengers to experience hydrogen-powered services as a direct substitute for diesel trains, with similar journey times and stopping patterns.

In the longer term, if hydrogen traction proves operationally reliable and cost-competitive on selected corridors, travelers could see the technology rolled out on other non-electrified regional lines where full catenary is not yet planned. This would complement ongoing electrification and emerging battery train projects, potentially giving passengers a mix of clean-traction technologies depending on the route.

Tourism regions served by secondary lines may particularly benefit if hydrogen trains enable quieter operations through scenic or environmentally sensitive areas while still offering the range and flexibility needed for longer rural services.

Hydrogen rail in a wider European context

Deutsche Bahn’s hydrogen initiative is unfolding within a broader European debate about the best alternatives to diesel on secondary and regional routes. Other rail operators have already introduced hydrogen multiple units from different manufacturers on commercial services, while some countries have focused more on battery trains or accelerated catenary expansion.

Analyses from industry and academic sources suggest that hydrogen trains are most competitive on longer non-electrified lines where battery-only operation would require frequent recharging or significant infrastructure upgrades, yet traffic levels do not justify the capital expense of full electrification. The fast-refueling concept tested by Deutsche Bahn is intended to address one of the key operational barriers to this model by ensuring that hydrogen top-ups can be performed within tight scheduling constraints.

Germany’s emerging hydrogen backbone for industry and heavy transport may also shape the future of hydrogen rail. As new pipelines, production hubs and storage facilities come online, rail operators could draw on a wider supply network instead of relying solely on site-specific electrolysis, potentially lowering costs and improving security of supply.

For now, the H2goesRail trials and their rapid refueling solution are being watched closely across the continent. The results will help determine whether hydrogen can move from demonstration to mainstream use on Europe’s non-electrified railways and what that will mean for travelers seeking lower-carbon journeys beyond the main electrified corridors.