FLIRT, Talent, Desiro & Co.: Telling Regional Multiple Units Apart

Updated: August 2026 – In long-distance services there are a handful of generations, in regional services dozens of variants – and most of them look like “some modern railcar”. This guide shows you how to tell multiple units apart: by cab shape, bogies, door layout and traction sound instead of by gut feeling.

Telling multiple units apart: the short answer

Identification works via four features in a fixed order: first the traction (diesel, electric, battery or hydrogen – recognisable by roof equipment and sound), second the position of the bogies (under the gangways between cars or under the middle of the cars), third the cab shape and fourth the door layout.

In most cases that settles the family. An example: a quiet electric multiple unit with a single bogie under each gangway and a steeply raked windscreen is very probably a FLIRT. An electric multiple unit with double-deck intermediate cars between single-deck end cars, on the other hand, can only be a Desiro HC. Where regional services end within the system at all is explained in the comparison of local and long-distance services for spotters.

The four identification features

Traction: what you hear and what’s on the roof

Diesel railcars have underfloor engines and carry exhaust and cooling equipment on the roof. When they pull away you hear the engine rev up, often with a noticeable pause between gears. Electric multiple units have a pantograph and a characteristic inverter sound when starting – a rising whine rather than an engine running.

Battery and hydrogen vehicles are the new special case: they run electrically but still carry equipment on the roof. Flat containers point to batteries, long cylindrical vessels to hydrogen tanks.

Running gear: Jacobs bogies as a telltale sign

Look at where the wheels are. On vehicles with Jacobs bogies, two adjacent car bodies share a bogie located exactly under the gangway. The FLIRT and the Talent 2 work on this principle. On conventionally designed vehicles, by contrast, there are two separate bogies per car, each towards the ends of the car.

This feature is particularly valuable because no refurbishment and no new livery changes it.

Cab shape: useful, but not decisive on its own

Fronts are what manufacturers design and customers individualise. They’re still useful as a feature if you focus on the basic shape rather than headlight details: steeply raked and drawn far down, angular and upright, or rounded with a wraparound windscreen.

Door layout and entrance height

The distribution of doors follows the platform height on the target network. Vehicles for low platforms have entrances with steps, vehicles for high platforms have level boarding. The number of doors per side of the car also differs significantly between versions suitable for S-Bahn (suburban rail) service and regional versions.

The feature table: regional multiple units compared

This overview is the core of the article. The areas of operation are kept general, because vehicles can change networks with every contract award.

Family	Manufacturer	Classes in Germany	Traction	Most striking feature	Typical deployment
FLIRT	Stadler	427, 428, 429, 430 and newer variants	Electric, also battery versions	Jacobs bogies, steeply raked windscreen	Regional Express and Regionalbahn, many competitively tendered networks
Talent 2	Bombardier / Alstom	442, 443	Electric	Curved front drawn far down, prominent roof equipment	Regional services in many German states
Talent 1	Bombardier	643, 644	Diesel	Very short modules, compact design	Branch lines and less busy routes
Desiro Classic	Siemens	642	Diesel	Two cars with one bogie in the middle	Branch lines, often hourly
Desiro HC	Siemens	462	Electric	Double-deck intermediate cars between single-deck end cars	High-demand Regional Express routes
Mireo	Siemens	463	Electric, also battery and hydrogen	Smooth modern front, single-deck	Newer regional contract awards
Coradia Continental	Alstom	1440 and related	Electric	Angular front, even division into modules	Regional services, often in multi-car units
Coradia LINT	Alstom	620, 622, 640, 648	Diesel, also a hydrogen variant	Rounded front, exhaust equipment on the roof	Non-electrified lines
ET 425 family	Bombardier / Alstom	423, 425, 426, 430	Electric	Smooth nose with coupling flap, wide doors	S-Bahn and regional services in conurbations
Link	Pesa	632, 633	Diesel	Distinctive front design, multi-car	Regional networks of individual operators

The typical mix-ups and how to resolve them

• FLIRT versus Talent 2: both use Jacobs bogies. The difference is in the front: the FLIRT looks pointier and more steeply raked, the Talent 2 rounder and wider. The Talent family comes from the development work of Bombardier Transportation. When in doubt, the vehicle number decides.
• Desiro Classic versus Coradia LINT: both are short diesel railcars for branch lines. The Desiro Classic is consistently two-car with a central bogie, while the LINT from Alstom exists in several lengths and has a considerably rounder front section.
• Mireo versus Coradia Continental: both are modern single-deck electric multiple units. The Coradia looks more angular, the Mireo smoother and more rounded.
• Battery vehicle versus electric multiple unit: a lowered pantograph on a non-electrified line is the decisive signal. Together with flat roof containers, that clearly points to a battery variant.
• Double-heading versus a long train: two coupled units look like one long multiple unit. Look for the coupling point with two cabs in the middle of the train.

If you want to cross-check your identification with the train number, the guide to decoding train numbers will help, and the unambiguous identification of an individual vehicle is handled by the twelve-digit number – explained in the guide to reading the UIC number.

Are you ready for identification in the field?

From features to trip planning

The practical value of knowing your vehicles lies not in identifying them, but in planning. Because transport authorities put services out to tender and operators procure batches of identical vehicles for them, a network’s fleet stays stable for years. That makes sightings predictable. At AKN Eisenbahn, for example, the same diesel railcar family has defined the scene for years, while a completely different one runs on the neighbouring network.

Which sources are suitable for the last point is described in the guide to regional transport associations and live departures. And if you want to follow a specific train all the way to your spot, you’ll find the tools in the guide on how to track a moving train.

Common mistakes when identifying multiple units

• Inferring the family from the livery. The same vehicle wears completely different colours depending on the operator. That doesn’t change its construction.
• Using the number of cars as a feature. Almost all modern families come in several lengths. Two-, three- and five-car units can be the same type.
• Ignoring roof equipment. It’s the quickest traction feature – and with battery and hydrogen vehicles, the only reliable one.
• Overrating the sound. Inverter sounds differ between production batches of the same family. Sound is fine as confirmation, but not as the sole feature.
• Transferring long-distance shapes. Some regional multiple units look like high-speed trains from a distance. The clear distinction is provided by the guide to the ICE classes from ICE 1 to ICE 4.
• Getting close to the track for a better picture. No identification feature justifies entering track areas or operational railway land. Photograph only from platforms and publicly accessible areas.

Conclusion

Regional services seem confusing because there are so many of them – not because the vehicles are hard to tell apart. Traction, bogie position, cab shape and door layout, in that order, provide a clean narrowing-down, and the vehicle number clears up anything left. Once you apply the system, you’ll quickly notice that your own region is shaped by just a few families – and that’s exactly what makes the exceptions visible. For getting into the hobby as a whole, it’s also worth looking at the tips for new trainspotters and the overview of trainspotting in Germany.