Key takeaways
- The Mireo Plus H is a fuel-cell multiple unit: hydrogen is converted into electricity on board, and a battery buffers power peaks and braking energy.
- Plus H means hydrogen, Plus B means battery – the letters distinguish the alternative drives within the Mireo family.
- The target market is non-electrified lines where diesel railcars have run until now.
- Field identification chain: roof structures yes, pantograph no, diesel noise no.
- Deployments depend on tenders and infrastructure: without a refuelling facility nearby, no hydrogen train runs – the fleet in service changes with timetable years.
Contents
Fact file
| Vehicle type | Multiple unit with hydrogen fuel-cell drive |
|---|---|
| Manufacturer | Siemens Mobility |
| Platform | Mireo – Siemens' regional multiple-unit family |
| Drive | Fuel cell combined with a traction battery |
| Energy carrier | Gaseous hydrogen in roof tanks |
| Maximum speed | 160 km/h |
| Typical use | Non-electrified lines in regional services |
| Emissions in service | No CO2 output at the vehicle; releases water vapour |
Identifying features
Is this really the class in front of you?
- No pantograph on the roof – unlike electric Mireo variants
- Clearly visible roof structures for hydrogen tanks and fuel-cell modules
- Mireo-typical nose shape with a large, deeply drawn-down windscreen
- Quiet pull-away with no diesel engine noise – electric drivetrain
- No diesel exhaust and no radiator grilles in the side walls
- The vehicle runs on lines without an overhead line, even though it sounds electrically driven
Updated: August 2026 – A multiple unit that runs electrically but has no pantograph: the Siemens Mireo Plus H gets its energy from hydrogen, which it carries in roof tanks. This page shows you how the drive works, how to identify the vehicle in the field, and how to tell it cleanly apart from diesel, battery and overhead-line vehicles.
Spotted a new drive concept first?
Log the vehicle, line, date and location in Traintrack – with young classes, every sighting is a data point.
What is the Siemens Mireo Plus H?
The Mireo Plus H is a regional multiple unit with a hydrogen fuel-cell drive from Siemens Mobility. It’s based on the Mireo platform, which Siemens Mobility also offers as a classic electric vehicle and as a battery-electric variant. It’s designed for 160 km/h.
The drive is consistently electric: a fuel cell converts the hydrogen it carries into electricity, and a traction battery buffers braking energy and power peaks when pulling away. No CO2 is produced at the vehicle – it releases water vapour. The target market is lines without an overhead line where diesel railcars have run until now.
How the drive shows up in the vehicle’s appearance
You don’t recognise alternative drives from a type plate but from what they technically need. That’s exactly what makes them easy to tell apart in the field.
| Vehicle type | Roof | Sound when pulling away | Distinguishing feature |
|---|---|---|---|
| Hydrogen multiple unit | Large structures, no pantograph | quiet, electric | Tank and fuel-cell modules |
| Battery multiple unit | Structures plus usually a pantograph | quiet, electric | Pantograph despite running without a contact wire |
| Electric multiple unit | Pantograph, flat roof | quiet, electric | Only runs under an overhead line |
| Diesel railcar | Exhaust, radiator structures | loud, engine running | Exhaust plume, radiator grilles |
For the Mireo Plus H, this gives a very simple check chain: roof structures present, pantograph absent, engine noise absent. If the line additionally has no overhead line, the identification is practically certain.
The one it’s most easily confused with is the Alstom Coradia iLINT, which follows the same principle but differs clearly in nose shape and body design. Siemens’ own battery-electric counterpart is the Siemens Mireo Plus B. Lighter and intended for more thinly served branch lines is the Stadler RS ZERO, which answers the same underlying question – regional services without a contact wire and without diesel – with a different vehicle concept.
Quick identification at the platform
Which alternative drive is this?
Fuel-cell multiple unit
Roof structures without a pantograph and an electric pull-away on a line without a contact wire point to a hydrogen vehicle like the Mireo Plus H. Check the vehicle number to confirm.
Battery multiple unit
A pantograph despite running on a line that isn't continuously electrified suggests a battery train recharging under the contact wire.
Diesel railcar
Engine noise, radiator structures and exhaust rule out a fuel-cell train. This one runs on classic combustion technology.
If you’d rather work systematically than just for this one vehicle, the guide to identifying rolling-stock classes helps – it explains in which order to work through features.
The vehicle number as the final word
Features narrow it down, the number decides – capture both in Traintrack in one step.
Where such vehicles are deployed
Hydrogen vehicles stand or fall with the refuelling infrastructure. A fuel-cell train needs a facility within reach; that’s why such vehicles are typically procured for a closed network rather than as individual diagrams scattered across the country.
For your search, that means:
- Networks without an overhead line are the right place to look – that’s exactly where the drive makes sense in the first place.
- Tenders and timetable years decide which vehicles run on which line. This changes and should always be checked against current information.
- Depots and refuelling stations are private premises. Traffic can be observed from publicly accessible locations, not from operational railway land.
- Community reports show what’s actually running faster than any overview.
Fleet size and deployment change
With young vehicle families, areas of deployment, fleet sizes and lines shift constantly – through tenders, certification steps and infrastructure projects. Don't rely on older lists; check the current picture through real-time information and sightings.
For the definite identification of a specific vehicle, there’s no way around the vehicle number. How the twelve-digit identifier is structured and what the check digit does is explained in the article on the UIC number.
Why platforms are changing vehicle identification
Modern manufacturers no longer build individual classes but platforms: a shared technical base from which several variants are derived. Mireo is exactly such a case – the same basic design carries the electric multiple unit, the battery variant and the hydrogen vehicle.
For identification in the field, this has two consequences.
The silhouette helps less than it used to. Nose shape, window layout and body shell are largely the same across all variants. Anyone looking only at the front can’t determine the type of drive – a difference from the steam and early diesel era, when body design and purpose were inseparably linked.
The drive technology becomes the identifying feature. Whatever energy a vehicle needs, it has to carry: pantographs, tanks, batteries, cooling systems. These components are visible and can be reliably told apart – mostly on the roof.
This gives a practical rule for all modern multiple units: roof first, then front, then number. The roof reveals the type of drive, the front the platform, the number the specific vehicle. Anyone working in this order correctly classifies even families they’re seeing for the first time – and avoids the most common mistake of inferring a familiar drive from a familiar nose shape.
Photo tips for vehicles with roof structures
With this vehicle type, the essential detail sits up top. A purely head-on shot shows a multiple unit like many others – only the roof area reveals the drive.
Choose a three-quarter view
An angle of roughly 30 to 45 degrees shows the front, side wall and roof structure at the same time – the most informative perspective for this vehicle.
Look for height where it's legal
Publicly accessible bridges and paths open up a view of the roof. Platform edges, tracks and operational railway land are not an option.
Capture the full side wall
Markings and the vehicle number belong in the frame, otherwise the sighting can't be verified later.
Keep the light low
Smooth body shells look flat in midday light. In the morning and late afternoon, edges and roof structures stand out much more clearly.
The general basics on location, exposure and composition are covered in the guide to taking good photos of trains.
Common mix-ups
It points to a Mireo Plus H if …
- large roof structures are present, but no pantograph
- the train pulls away quietly and without engine noise
- the line has no overhead line
- the nose shape matches the Mireo family
Look more closely if …
- a pantograph is fitted – then it's more likely a battery or electric vehicle
- you can't see the roof
- another manufacturer is running a similar concept
It's not a Mireo Plus H if …
- you hear a running combustion engine
- exhaust or radiator grilles are visible
- the vehicle runs continuously under the contact wire with its pantograph raised
Conclusion
The Mireo Plus H is a good example of the fact that modern drives can indeed be identified in the field – you just need to know what to look for. Roof structures without a pantograph, an electric pull-away sound and a line without an overhead line together give a clear picture. Because areas of deployment for young vehicle families depend heavily on tenders and infrastructure: features are stable, deployments aren’t – always check the current picture.
In short
A hydrogen multiple unit on the Mireo base, 160 km/h, fuel cell plus battery. Identification chain: roof structures yes, pantograph no, diesel noise no – and the number confirms it.
Document the change in regional services
Alternative drives are arriving and transforming entire networks – record what ran when and where.
Summary
- The Mireo Plus H is the hydrogen variant of Siemens' regional platform Mireo and combines a fuel cell with a traction battery.
- It's designed for 160 km/h and replaces classic diesel railcars on lines without an overhead line.
- It's identified by the roof structures for tanks and fuel cells, combined with the absence of a pantograph.
- Where and how long such vehicles run depends on tenders and refuelling infrastructure and should be checked against current information.
Frequently asked questions
What is the Siemens Mireo Plus H?
A multiple unit with a hydrogen fuel-cell drive based on the Mireo platform from Siemens Mobility. The hydrogen is carried in roof tanks and converted into electrical energy in a fuel cell; a traction battery buffers braking energy and power peaks. The maximum speed is 160 km/h.
What does the H in the type designation mean?
It stands for hydrogen (chemically H2). Siemens uses it to distinguish variants within the Mireo family: Plus H denotes the fuel-cell train, Plus B the battery-electric train. The base platform, with body shell, bogies and interior concept, is the same in both cases.
How do I tell it apart from a diesel railcar?
By the sound and the roof structures. The Mireo Plus H pulls away electrically – with no engine noise, no exhaust plume and none of the typical radiator grilles in the side walls. Instead, large structures for tanks and fuel-cell modules sit on the roof, but no pantograph.
Why build hydrogen trains when overhead lines exist?
Because far from every line is electrified, and electrification can be expensive and slow. Diesel railcars have traditionally run on such lines. Fuel-cell and battery trains are the two ways of switching to electric drive there without rebuilding the infrastructure entirely.
What's the difference from a battery train?
The energy source. A battery train charges on overhead-line sections or at charging stations and stores the energy directly. A hydrogen train generates its electricity on board from the hydrogen it carries and needs a refuelling facility for that. Hydrogen usually allows longer runs without recharging, but requires its own infrastructure.
What comparable vehicles are there?
The best-known competitor is Alstom's Coradia iLINT, likewise a fuel-cell multiple unit for non-electrified lines. Within the Siemens family, the Mireo Plus B is the battery-electric counterpart. All three target the same area of use: diesel-free regional services.
Where do such trains run?
That depends on traffic contracts and refuelling infrastructure and changes with tenders and timetable years. Hydrogen trains make sense where a network without an overhead line is served from one location. For the current picture, checking timetable information and community reports is more useful than older overviews.
What should I pay attention to when photographing one?
The roof area. The structures are the actual identifying feature and get lost in a purely head-on shot. A slightly raised, publicly accessible vantage point or a three-quarter view shows the front, side wall and roof structure at the same time. Platform edges and track areas remain off limits.
Log your sighting of the Siemens Mireo Plus H
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