When the Coradia iLint rolled into view at Berlin’s InnoTrans rail expo in 2016 C.E., it looked like an ordinary regional train. But its exhaust was water vapor. That single fact represented something the rail industry had spent decades trying to achieve: a zero-emissions passenger service that could replace diesel on lines not connected to the electric grid.
Key details
- Hydrogen passenger train: The Coradia iLint, built by French rail manufacturer Alstom, runs entirely on hydrogen fuel cells — emitting only steam and condensed water, with no particulate exhaust or carbon emissions.
- Fuel cell range: The train carries enough hydrogen storage for a 497-mile range and reaches speeds of up to 87 miles per hour, making it a practical replacement for diesel regional trains.
- Onboard energy system: Excess energy generated during braking is captured and stored in onboard lithium-ion batteries, improving overall efficiency — a design borrowed from hybrid vehicle engineering and applied at rail scale.
Why diesel still dominates — and why that’s a problem
Roughly half of the world’s rail network runs on diesel, according to the International Energy Agency. Electrifying every kilometer of track is expensive, often impractical in rural or mountainous terrain, and takes decades to complete.
Diesel trains are loud, produce nitrogen oxide and particulate matter, and contribute meaningfully to transport emissions. In Germany alone, thousands of kilometers of non-electrified regional track serve communities that depend on rail for daily life. For those routes, hydrogen offered a path that overhead wires could not.
The iLint was Alstom’s answer to that gap. Development began years before the 2016 C.E. debut, with engineers adapting fuel cell technology — already proven in buses and forklifts — to the specific demands of passenger rail: heavier loads, longer distances, and tight maintenance schedules.
How the hydrogen gets made
One of the less-discussed details of the iLint’s launch was where its hydrogen came from. Rather than energy-intensive electrolysis from scratch, the hydrogen used in early trials was recovered from waste by-products of chemical manufacturing — a form of industrial recycling that reduced both cost and emissions footprint.
This approach reflects a broader principle in clean energy transitions: the cleanest next step is often not the ideal endpoint, but a practical bridge. Hydrogen sourced from industrial waste is not the same as green hydrogen produced entirely from renewable electricity, but it still represents a significant improvement over burning diesel in a passenger cabin.
The question of hydrogen sourcing remains one of the field’s live debates, and it matters enormously. Green hydrogen — produced via electrolysis powered by wind or solar — is still expensive to produce at scale. The iLint’s promise is only as clean as the hydrogen supply chain behind it.
From unveiling to revenue service
The 2016 C.E. unveiling was a prototype demonstration. The Coradia iLint entered full commercial passenger service in Lower Saxony, Germany, in 2022 C.E., operating on a 100-kilometer regional route — the first hydrogen train in revenue passenger service anywhere in the world. Fourteen trains were deployed, replacing diesel units on a line connecting several small cities.
Other countries moved quickly. The U.K., Italy, and South Korea all announced hydrogen rail programs within a few years of the iLint’s demonstration. Railway Technology reported that Alstom received orders from multiple European operators, and competing manufacturers began developing their own hydrogen rolling stock.
The six years between prototype and service are worth noting. Infrastructure — hydrogen fueling stations, maintenance protocols, regulatory frameworks — takes time to build. The gap between unveiling and operation is not a failure; it is the normal pace of bringing a genuinely new technology into a safety-critical industry.
Lasting impact
The iLint established that hydrogen fuel cell propulsion was viable for mainline passenger rail — not just in theory, but in engineering reality. That proof of concept changed what rail operators, governments, and manufacturers believed was possible.
It also shifted the policy conversation. Before 2016 C.E., most decarbonization plans for rail assumed full electrification as the only serious option. After the iLint, hydrogen became a credible alternative for routes where electrification was uneconomical. That widened the scope of what a zero-emissions rail network could look like — and accelerated investment in hydrogen infrastructure more broadly.
Germany’s decision to support and host this development was part of a longer national commitment to decarbonizing its transport sector, though the country’s overall energy transition has been uneven and politically contested. The train is a milestone within a much larger, still-unresolved transformation.
Blindspots and limits
Hydrogen trains are not a universal solution. On heavily used corridors, overhead electrification remains more efficient and cost-effective over the long run. The iLint’s range and speed are impressive for regional routes, but the technology faces real economic competition from battery-electric trains, which have also advanced rapidly since 2016 C.E.
Green hydrogen production at scale remains limited. Until renewable energy powers the majority of hydrogen production, the climate benefit of hydrogen trains depends heavily on the local energy mix — and that varies enormously by country and region. The train itself is clean. The fuel chain behind it is still a work in progress.
Read more
For more on this story, see: LinkedIn — World’s first zero-emissions hydrogen train unveiled in Germany
For more from Good News for Humankind, see:
- Renewables now make up at least 49% of global power capacity
- Indigenous land rights at COP30: 160 million hectares recognized
- The Good News for Humankind archive on renewable energy
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