The Heidekrautbahn, a regional line running north of Berlin, has drawn a positive balance from operating its trains on hydrogen fuel cells and batteries, Heise reported on 16 October — a concrete data point for rail operators looking for a way off diesel on routes that will never get overhead wires.
The line has been one of Germany's most visible hydrogen rail testbeds. Combining fuel cells with a battery helps on two fronts: the battery absorbs acceleration peaks and recovers braking energy, letting the fuel cell run at a steadier, more efficient output, while the pairing also reduces the amount of hydrogen the fleet must carry and refuel.
The results now being reported are the kind of operational evidence the sector has been short of. The open questions that remain are less about whether the trains work than about what they cost to run — the price and carbon intensity of the hydrogen supply, the reliability of refuelling infrastructure, and how the economics compare with simply stringing up electric wires on busier lines.
Regional rail is a small part of transport emissions but a stubborn one, because the cheapest decarbonisation option — batteries alone — runs out of range on long rural routes. Hydrogen's case rests on exactly those lines, which makes the Heidekrautbahn's numbers worth watching.
