Key takeaways
- 427 = three-part FLIRT: in this family, the class number mainly encodes the length of the unit.
- Quickest way to identify it: count the car sections, then check whether there's only one bogie between two of them.
- 428 and 429 are the same vehicle type with four and five car sections respectively – the most common mix-up.
- Operators change with every tender: livery and network say nothing about the class.
- The twelve-digit UIC number starts with 94 for every electric multiple unit and is the only unambiguous proof.
Contents
Fact file
| Vehicle type | Electric articulated multiple unit for regional and local services |
|---|---|
| Manufacturer | Stadler (FLIRT vehicle family) |
| Car sections | three, fully walk-through |
| Design | Articulated unit with Jakobs bogies between the car sections |
| Electrification system | 15 kV / 16.7 Hz AC via pantograph |
| UIC type code | 94 – electric multiple unit |
| Typical use | Regional express and regional services under overhead line |
Identifying features
Is this really the class in front of you?
- Three car sections that run into each other with no partition
- Only one bogie between the car sections (Jakobs bogie)
- Low-floor boarding in the middle area of each car section
- Smooth, gently rounded front with a large single-piece windscreen
- Vehicle number starts with 427, intermediate cars carry their own number
- One pantograph on the roof, no side current-collector shoes
Updated: August 2026 – A low-floor multiple unit with three car sections, a smooth front and a single bogie at every gangway: that’s Class 427, the three-part version of the Stadler FLIRT. This page shows you what to look for, how to tell it apart from its longer sisters, and what to watch for when photographing it at the platform.
Spotted a FLIRT? Note the number.
Counting car sections takes seconds – noting the vehicle number just as long. Traintrack turns that into a sighting you can actually use.
What is Class 427?
Class 427 is an electric articulated multiple unit from Stadler’s FLIRT family, built with three car sections. It runs under the German overhead-line system at 15 kV and 16.7 Hz and is designed for regional and regional express services – the traffic between S-Bahn and long-distance rail.
Important for understanding the number: in this family, the class essentially encodes the length of the unit, not the manufacturer. Three car sections give the 427, four the Class 428, five the Class 429. Anyone who knows this relationship has already done half the identification work. An overview of the whole vehicle family and its generations is on the Stadler FLIRT page.
How to identify a 427 in three steps
Count the car sections
Scan the unit once and count the body segments between the two cabs. Three sections point to the 427.
Check the gangways
If there's only one bogie at each gangway, you're looking at an articulated unit with Jakobs bogies – a core feature of the FLIRT.
Look at the roof
One pantograph, flat equipment casings, no side current-collector shoes: that's an AC multiple unit for the overhead line, not an S-Bahn vehicle with a third rail.
If any doubt remains, the vehicle number settles it. How to find and correctly read it is explained in the guide to the UIC number and its system; the general order for identification is in the guide to identifying classes.
Shape beats colour
Livery changes with every tender, the design doesn't. Get into the habit of counting car sections and bogies first, and only then look at colour and logo.
Where Class 427 fits into rail operations
Regional multiple units like the 427 serve the wider network – at eurobahn in East Westphalia just as elsewhere: many stops, short spacing, high passenger-exchange times. For observation that yields a simple rule – you’ll find them most reliably where electrified regional lines meet a hub station, for example in the network of Hessische Landesbahn (HLB).
| Location | Likelihood | Why |
|---|---|---|
| Regional hubs with overhead line | high | Several regional lines converge here, often with turnaround time at the platform |
| Smaller wayside stations | medium | Short stops, but a clear view of the whole unit |
| Pure long-distance routes | low | Long-distance multiple units and locomotive-hauled trains dominate there |
| Non-electrified lines | none | Without overhead line, the 427 doesn’t run |
| Stabling sidings and depots | – | Operational railway land, not an accessible viewing spot |
Deployment areas aren't permanent
Which operator runs which units on which network depends on service contracts and vehicle pools. Both change with tenders and timetable years. Check the current picture rather than relying on older overviews.
If you want to sort out the general difference between service types, you’ll find it in the article on regional versus long-distance services from a spotter’s view. For choosing a spot, it’s worth looking at the overview of the best stations for trainspotting in Germany.
Which unit are you still missing?
With a well-kept sighting list you can see at once which numbers you already have – and which you don't.
Photographing at the platform: what’s different for multiple units
You photograph a locomotive as a single object. A multiple unit is a continuous body, where only its length makes the point. That changes how you plan the shot.
Enough distance for the full length
A three-part unit needs noticeably more room at the platform than a locomotive. Find a spot near the end of the platform from which all three car sections fit in the frame.
Three-quarter view instead of a front-on shot
Around 30 to 45 degrees off the vehicle axis show the front and side wall together – only that makes the articulated design visible.
Document the number separately
A second, tighter shot of the side wall with a legible vehicle number turns a nice photo into a sighting that holds up.
Plan for the light at the platform
Platform roofs create hard shadow edges. A spot outside the covered area often achieves more than any post-processing.
Which focal length makes sense for this is covered in the guide to the best telephoto lens for railway photography; the general technique is in the guide on taking good photos of trains.
Safety: the platform is not a photo studio
Regional multiple units stop at platforms where many people are moving about at the same time. That’s exactly where most avoidable incidents happen.
- Stay behind the safety line. The area in front of the white line belongs to the vehicle, not to you. An arriving multiple unit also creates a noticeable slipstream.
- Never step into the track area. Tracks, operational railway land and stabling sidings are off limits and, as a rule, operational property. No shot justifies entering it.
- No flash towards the cab. Dazzling the driver is a real hazard, not a trivial matter.
- Keep an eye on your bag and tripod. On crowded platforms they’re the most common tripping hazard.
- Don’t sit or stand on the platform edge. Even on an apparently clear line, a train can arrive at any time, and stepping back from that position is barely possible.
What legally and practically applies to the distance from the track is covered in the article on the rules for the safe distance at the track – local rules always decide in individual cases.
Common mix-ups
It points to the 427 if …
- you count exactly three car sections
- there's only one bogie at each gangway
- there's a single pantograph on the roof
- the vehicle number starts with 427
Look more closely if …
- the train consists of two coupled units – then it's easy to miscount
- the livery is unfamiliar and you want to infer the class from the operator
- the front looks similar but the number of car sections is four or five
It isn't a 427 if …
- every car has two bogies of its own – then it isn't an articulated unit of this type
- you see double-deck cars
- side current-collector shoes are present instead of a pantograph
- the number starts with 428 or 429 – then it's the longer FLIRT
The most practically important distinction is within the family itself: 427, 428 and 429 differ, to the naked eye, almost only in the number of car sections. So count before you commit.
Conclusion
Class 427 is a vehicle you learn once and then recognise everywhere – provided you pay attention to the design rather than the colour. Three car sections, Jakobs bogies at the gangways, one pantograph on the roof: that’s all it takes for identification. The vehicle number provides confirmation, and because operators like NordWestBahn and their networks change, it’s in the long run also the only piece of information that lasts.
In short
Three car sections plus Jakobs bogies plus a pantograph add up to Class 427. Car count separates it from 428 and 429 – the full vehicle number clears up everything else.
All your multiple-unit sightings in one place
Number, date, place and photo captured together – so you'll still know years later which unit was running where.
Summary
- The FLIRT is one of the most widespread regional multiple units under German overhead line; Class 427 denotes the three-part version.
- Two observations are enough for identification: the number of car sections and the design of the gangways.
- Because service contracts are regularly retendered, livery and deployment area change more often than the vehicle itself.
- Anyone who logs sightings with the full vehicle number can later trace which unit ran where and when.
Frequently asked questions
How do I identify Class 427 with confidence?
Count the car sections: Class 427 has three. Then check the gangways – there's only a single bogie between each pair of car sections. This combination of articulated design and three sections sets the FLIRT apart from almost all other regional multiple units. The vehicle number on the side wall provides the final proof.
What's the difference between Class 427, 428 and 429?
It's the same vehicle type in different lengths. The 427 has three car sections, the 428 four and the 429 five. They're closely related technically and visually, so if in doubt simply count the car sections – or read the vehicle number.
What does the 94 at the start of the vehicle number stand for?
The twelve-digit UIC number begins with a two-digit type code for traction vehicles. 94 denotes an electric multiple unit or railcar. Country code, class and running number follow. So the code tells you about the vehicle type, not the manufacturer.
What are Jakobs bogies and why do they matter for the FLIRT?
A Jakobs bogie carries two neighbouring car sections together, instead of each car getting two bogies of its own. On the FLIRT you therefore see only one bogie at each gangway. It's an excellent distinguishing feature against multiple units with conventional car construction.
Which operators run Class 427?
That changes constantly. Regional services in Germany are put out to tender, and vehicles change operator with each award or go back to a vehicle pool. So don't rely on older lists – check the current picture for your network.
Does Class 427 also run without overhead line?
No. The 427 is a purely electric multiple unit and draws its power from the overhead line via a roof-mounted pantograph. On non-electrified lines, diesel multiple units or battery vehicles are used instead – sometimes similar in appearance, but technically something quite different.
Where do I find the full vehicle number on the FLIRT?
Usually on the side wall of each car section, often at underframe height or next to the doors. Each car section carries its own number, and the unit as a whole is identified by the running number. For a clean record, the best approach is to note the number of a driving car.
Why do FLIRT trains from different operators look so different?
Because livery and interior fittings are the customer's choice, not the manufacturer's. Front shape, door placement and articulated design, on the other hand, stay the same. If you go by shape rather than colour, you'll recognise the FLIRT even in a livery you don't know.
Log your sighting of the Class 427 (Stadler FLIRT)
Date, location and vehicle number logged in seconds – and visible to the community.
Related classes
Class 428 (Stadler FLIRT)
Class 428 is the four-part Stadler FLIRT. Count the car sections, check the gangways, read the number – and you'll reliably tell it apart from 427, 429 and the four-digit FLIRT variants.
EMUClass 429 (Stadler FLIRT)
Class 429 is the longest version of the Stadler FLIRT, with five car sections. Car count and gangway design lead you reliably to the right answer.
EMUStadler FLIRT
The FLIRT is Stadler's most widespread regional multiple unit in Germany. Class 427, 428 or 429 – the number tells you straight away how many cars the train has.
EMUClass 563 (Siemens Mireo)
Class 563 belongs to the Siemens Mireo family. How to recognise the Mireo, how the number blocks 463, 1463 and 563 relate, and what sets it apart from the FLIRT.
EMUBombardier Flexity Berlin (GT6-12 ZRL)
The Flexity Berlin is BVG's modern low-floor tram. The type code GT6-12 ZRL reveals almost everything – once you know how to read it.
EMUBombardier Leoliner (Leipzig)
The Leoliner is the low-floor tram developed in Leipzig, deliberately kept simple. How to recognise it and how it differs from the larger LVB types.
Who is behind it
Groups, brands, manufacturers and operators – who owns whom and how to recognise them out in the field.
Abellio
Abellio was the overseas arm of the Dutch state railway and ran several regional networks in Germany. After the restructuring of its German business, contracts and vehicles moved on – but the traces on the vehicles are still readable today.
Brandeurobahn
eurobahn is a transport brand in North Rhine-Westphalia and neighbouring Lower Saxony. It's operated by a company that belongs to the French Keolis group – and so, several steps removed, to SNCF. On the vehicle you see none of that, just three letters.
GroupHessische Landesbahn (HLB)
The Hessische Landesbahn is a group of several companies: one for passenger services, one for freight, one for its own infrastructure. The train usually just says HLB or a brand name – you only find out the operating company from the data panel.
BrandNordWestBahn
NordWestBahn is the brand of a regional transport provider in north-west Germany, whose operating company belongs to an internationally active group. It's especially instructive because of its S-Bahn services: the term means something entirely different here than in the big conurbations.
Related guides from the blog
