Key takeaways
- The RABe 511 is a double-deck electric multiple unit from SBB's KISS family for regional and RegioExpress services.
- Fastest way to identify it: two rows of windows, no locomotive, SBB markings, the designation RABe 511.
- The biggest source of confusion is the double-deck push-pull set with a locomotive – the difference is at the ends of the train.
- The designation names both classes but no luggage compartment: RABe rather than RABDe.
- Formation lengths, lines and diagrams change – check the current situation before your trip.
Contents
Fact file
| Vehicle type | Double-deck electric multiple unit for regional and RegioExpress services |
|---|---|
| Designation | RABe 511 – R = high-speed, A = 1st class, B = 2nd class, e = electric |
| Design | Double-deck EMU from the Stadler KISS family |
| Formation | Procured in various lengths |
| Operator | SBB |
| UIC country code | 85 (Switzerland) |
Identifying features
Is this really the class in front of you?
- Two rows of windows stacked along most of the train's length
- A continuous multiple unit with no separate locomotive
- Regional and RegioExpress destinations on the display
- The designation RABe 511 and SBB markings on the vehicle
- Low-set door areas, with the body rising towards the upper deck in between
- No D in the designation – first and second class, no luggage compartment in the name
Updated: August 2026 – Two rows of windows, no locomotive, a regional destination on the display: that’s the RABe 511, known day to day as the Regio-Dosto. This page explains the Swiss designation, shows the key distinction – multiple unit versus push-pull set – and gives practical tips for spotting and photography.
Spotted a Regio-Dosto? Note the number.
With large series, it's the vehicle number that turns an observation into a sighting – logged in seconds with Traintrack.
What is the SBB RABe 511?
The SBB RABe 511 is a double-deck electric multiple unit for regional and RegioExpress services from the KISS family built by Stadler Rail. It runs as a single operating unit with no separate locomotive and carries both first and second class. It was procured in various lengths – so train length alone is not a reliable identifying feature.
The basic idea is simple: where platforms can’t be extended, you find extra capacity in height instead. On heavily used lines, a second deck adds significantly more seats per train without touching the infrastructure. SBB applies the same principle in long-distance traffic with the RABe 502, the FV-Dosto.
Reading the designation: RABe 511
Swiss vehicle designations are compact profiles. Once you can read them, you can place even unfamiliar vehicles.
Capital letters: what's on board
For multiple units, the capital letters name the classes and compartments carried: A first class, B second class, D luggage compartment. The leading R marks a high-speed vehicle.
Lower-case letters: how it runs
The lower-case e stands for electric traction. An h would stand for rack-and-pinion drive – a letter you find on Swiss mountain railways but never in the lowlands.
Number: series or fraction
Modern multiple units carry three-digit series numbers such as 511. Older vehicles carry a fraction: the numerator is the number of powered axles, the denominator the total axle count, as in Re 4/4. Roman numerals afterwards, as in Re 4/4 II, denote successive production batches.
For how to turn this system into a fixed sequence of observations, see the guide to identifying rolling stock classes. The internationally valid vehicle number, with Switzerland’s country code 85, is explained in the article on reading the UIC number.
Multiple unit or push-pull set? The decisive distinction
This is the most common source of confusion with double-deck vehicles on the Swiss network – and it’s settled in seconds once you know what to look for.
A push-pull set consists of a separate locomotive, a rake of coaches and a driving trailer at the other end. The locomotive can be uncoupled and used elsewhere, carries its own designation following a pattern like Re 4/4 or Re 450, and stands out clearly from the rest of the train in height, shape and window arrangement. A good comparison is the Re 450, which runs exactly this kind of double-deck push-pull service.
A multiple unit like the RABe 511, by contrast, is a single unit: the traction equipment is distributed along the train, the vehicle is operated as a whole and carries a single designation.
Look at the front of the train
If the leading vehicle clearly stands out in height and shape from the rest, it's a locomotive – so you're identifying the locomotive, not the train. If the bodyshell line runs without a break right up to the cab windscreen, you've got a multiple unit.
Spotting it on the platform
| What you observe | What you see | What it tells you |
|---|---|---|
| Rows of windows | two, stacked | double-deck vehicle |
| Front of the train | continuous bodyshell | multiple unit, not a push-pull set |
| Operator markings | SBB | rules out other operators |
| Designation | RABe 511 | unambiguous identification |
| Destination | regional or RegioExpress line | rules out the FV-Dosto |
| Train length | varies | not a reliable feature |
Lines and lengths change
Which services the RABe 511 runs, and in what length, shifts with timetable changes, demand and vehicle availability. Rely on current information and sightings rather than older overviews found online.
See what's out there right now
Community sightings show you current vehicle deployments – handy when you're after a specific unit.
Photography and documentation tips
Double-deck vehicles in local traffic offer plenty of opportunities, but rarely good conditions: short dwell times, crowded platforms, a tall bodyshell.
Distance instead of wide angle
Head to the end of the platform and work with a longer focal length. A wide angle shot up close creates converging lines that tip the tall bodyshell in an unflattering way.
Look for a three-quarter view
About 30 to 45 degrees to the vehicle axis shows the front and the side at once – far more three-dimensional than a purely frontal shot.
Always get the markings
A second, tighter shot of the vehicle number is the real proof. Without that shot, a sighting is hard to verify later.
Sort straight after the trip
Anyone who sorts photos only weeks later loses context. A fixed filing system saves time and keeps the collection usable in the long run.
What such a filing system can look like, and which mistakes to avoid when sorting, is covered in the guide to building a photo archive for spotters. On the platform, one rule applies without exception: stay behind the safety line and never step onto tracks or operational railway land. The rules are set out in the article on the safe distance from the track.
One more thought on the system: SBB’s three-digit series numbers are assigned sequentially and not sorted by design. There’s no technical relationship between 502, 511 and 515 – they’re different vehicles from different orders and generations. Anyone trying to read something into the number itself will regularly get it wrong.
What is reliable instead is the sequence: design, purpose, markings. You spot the design from a great distance: one or two rows of windows, locomotive or no locomotive. You read the purpose off the destination display and the stopping pattern. And only then do you need the markings, which are easier to read up close anyway. This sequence works even if you’ve never seen the specific vehicle before – and it carries over to any other country.
Common mix-ups
It points to the RABe 511 if …
- the train has two rows of windows stacked one above the other
- there's no separate locomotive leading the train
- a regional or RegioExpress destination is displayed
- SBB and RABe 511 are marked on the vehicle
Look more closely if …
- a double-deck multiple unit from another operator is in the frame
- you only see one car in the middle of the train
- the train length throws you off – it varies within the series
It's not a RABe 511 if …
- the train is single-deck
- a separate locomotive is pulling or pushing at the front
- a long-distance destination is shown and the marking reads RABe 502
The hardest comparison outside SBB’s own fleet is BLS’s RABe 515 “MUTZ” from the same double-deck family. Here the operator markings decide, not the shape.
Conclusion
With the RABe 511, the trickiest step isn’t identifying the type of vehicle but telling it apart from double-deck push-pull sets. Once you make a habit of looking at the front of the train first, that question is settled in seconds. After that, the destination and the markings reliably get you the rest of the way – and for your collection, it’s the full vehicle number that counts.
In short
Two rows of windows, a continuous bodyshell right up to the cab windscreen, a regional destination: that's the Regio-Dosto. Train length won't help you – the markings will.
Your Swiss double-deckers in one place
Number, line, date and photo in one app – so you keep track even with large series.
Summary
- Double-deck multiple units are the answer to limited platform lengths: more seats per train rather than longer trains.
- The Swiss designation describes classes and traction, while the three-digit number places the vehicle within the fleet.
- For identification, the front of the train decides: locomotive or continuous bodyshell.
- For photography, the tall bodyshell needs distance, a longer focal length and flat light.
Frequently asked questions
What does the designation RABe 511 mean?
R stands for a high-speed vehicle, A for first class, B for second class, and the lower-case e for electric traction. The 511 is SBB's three-digit series number. The designation contains no D for a luggage compartment.
What is a KISS multiple unit?
KISS is Stadler's product name for its family of double-deck multiple units. Vehicles from this family are procured by various railways in different lengths and fit-outs. So two KISS units can look very similar yet belong to different operators and series numbers.
How do I tell a double-deck multiple unit apart from a push-pull set?
By the front of the train. A push-pull set consists of a separate locomotive and a rake of coaches with a driving trailer; the locomotive stands out clearly in height, shape and window arrangement and carries its own designation. On a multiple unit, the bodyshell line runs without a break all the way to the cab windscreen.
How many cars does the RABe 511 have?
The vehicles were procured in various lengths. Length is therefore not a reliable feature for identification – two trains in the same series can be different lengths. Rely instead on the design, the markings and the vehicle number.
What is the difference between the RABe 511 and the RABe 502?
Both are double-deck SBB multiple units, but for different types of service. The RABe 511 runs in regional and RegioExpress services, while the RABe 502 is the long-distance double-decker (FV-Dosto). The destination display is a strong first clue, but the designation on the vehicle settles it.
Why are double-deck trains used in regional traffic?
Because platform lengths at stations are limited and can't always be extended. A second deck adds significantly more seats for the same train length. On heavily used lines that's the decisive advantage over single-deck vehicles – and often cheaper than running extra trains.
Where does the RABe 511 run?
In SBB's regional and RegioExpress services. Exactly which lines and diagrams it covers changes with timetable years, engineering works and vehicle availability. So check the current situation via journey planners and community sightings rather than older lists.
How do I log a sighting properly?
With the full vehicle number, date, location and line. Swiss vehicles carry the country code 85 in their UIC number. With a series of identical-looking double-deck multiple units, the number is the only piece of information that tells one sighting apart from the next.
Log your sighting of the SBB Class RABe 511 (Regio-Dosto)
Date, location and vehicle number logged in seconds – and visible to the community.
Related classes
SBB RABe 502 (FV-Dosto)
The RABe 502 is SBB's double-deck long-distance train from the Twindexx family. Here's how to read the designation and identify it reliably on the platform.
EMUBLS RABe 515 (MUTZ)
The RABe 515 'MUTZ' is BLS's double-deck multiple unit from the Stadler KISS family. Here's how to read the Swiss designation and recognise it on the platform.
Electric locoSBB Re 450
The Re 450 is the locomotive of the Swiss double-deck push-pull train in S-Bahn service. This page shows how the set is put together and what that means for spotting.
EMUSOB RABe 526 (Traverso)
The SOB RABe 526 “Traverso” is a multiple unit from the FLIRT family built for longer journeys. Here's how to recognise it and tell it apart from the other 526 series.
EMUThurbo RABe 526 (GTW)
The Thurbo RABe 526 is a GTW – recognisable by the short power module in the middle of the train. And the fraction 2/6 or 2/8 instantly tells you how many axles are powered.
EMUBhe 4/8
Bhe 4/8 means: second class, rack-and-pinion drive, electric, four of eight axles powered. Here's how to read the Swiss designation and spot the unit in the field.
Who is behind it
Groups, brands, manufacturers and operators – who owns whom and how to recognise them out in the field.
Tram-Museum Zürich
The Tram-Museum Zürich doesn't sit in a hall on the edge of town, but in a former operational depot on the active network. Historic trams run from here on the same metre-gauge tracks used by scheduled services – a museum that moves right through the middle of operations.
ManufacturerStadler Rail
Stadler Rail grew from a small workshop in Thurgau into one of Europe's defining vehicle builders. The product names FLIRT, KISS and GTW appear nowhere on the vehicle – yet you can still identify the matching designs from a great distance once you know what to look for.
State railwaySchweizerische Bundesbahnen (SBB)
SBB doesn't label its vehicles with a class number but with a combination of letters that codes speed, coach class and type of traction. Anyone who can read Re, RABe and Ee identifies a Swiss vehicle faster than any database lookup.
Where to see the SBB Class RABe 511 (Regio-Dosto)
Specific viewpoints with lighting times, coordinates and an honest verdict on whether the trip is worth it.
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