Key takeaways
- "Reihe" is the Austrian term for what the DB calls "Baureihe" – four digits instead of three.
- The first digit states the vehicle type: 1 electric locomotive, 2 diesel locomotive, 4 electric multiple unit, 5 diesel multiple unit.
- The keeper marking is essential reading for vehicles that have changed owner.
- The UIC number beats the livery: colour and lettering change, the number stays.
- Current deployment locations are variable and depend on contracts and engineering works.
Contents
Fact file
| Vehicle type | Four-axle diesel-hydraulic main-line locomotive |
|---|---|
| Designation system | ÖBB Class 2143 – four-digit class number, leading 2 means diesel locomotive |
| Wheel arrangement | B'B' (two two-axle bogies) |
| Power transmission | Diesel-hydraulic via a torque converter |
| Manufacturer | Simmering-Graz-Pauker (SGP) |
| Years built | from the 1960s |
| UIC identification | Type code 92 for diesel locomotives, country code 81 for Austria |
Identifying features
Is this really the class in front of you?
- No pantograph on the roof, instead cooling equipment and an exhaust
- Four axles in two two-axle bogies
- Four-digit class marking, beginning with 2143
- On vehicles that have been transferred, a keeper marking next to the vehicle number
- Liveries often differ from the former state-railway scheme
Updated: August 2026 – “ÖBB Class 2143” isn’t a random vehicle name, but a readable code. This page is less about technology and more about designation systems, keeper markings and the second careers of these four-axle diesel locomotives – exactly the knowledge that helps you with every Austrian sighting.
The number beats the livery
For vehicles that have changed keeper, only the number stays reliable – note it straight away in Traintrack.
What’s behind the designation ÖBB Class 2143?
Class 2143 is a four-axle diesel-hydraulic main-line locomotive, built from the 1960s onward by Simmering-Graz-Pauker for the Austrian Federal Railways. It has the wheel arrangement B’B’ and transmits engine power to the axles via a torque converter.
The technical side of these machines is covered in detail on the page for Class 2143 and its recognition features. Here it’s about the other half of the knowledge: how the designation is structured, what it reveals about the vehicle, and how to identify machines that no longer belong to the state railway at all.
“Reihe” instead of “Baureihe”: the Austrian system
Anyone coming from Germany trips over the word first. Deutsche Bahn speaks of Baureihen with three-digit numbers, the ÖBB of Reihen (classes) with four-digit numbers. Both systems do the same job but are built differently – and the Austrian one is even more informative.
First digit: the vehicle type
1xxx electric locomotive, 2xxx diesel locomotive, 4xxx electric railcar or multiple unit, 5xxx diesel multiple unit. This rule applies consistently.
Further digits: the type
They identify the specific design. Neighbouring numbers often mean related technology or build stages that build on one another.
UIC number: the individual vehicle
Twelve digits, with a type code at the start – typically 92 for diesel locomotives – and the country code 81 for Austria.
Keeper marking: today's owner
A letter combination next to the number. For vehicles that have changed owner, it's often the most important piece of information of all.
How to fully decode a twelve-digit vehicle number and check it with the check digit is explained in the guide to the UIC number on the vehicle.
Second careers: what happens to locomotives after the state railway
A significant proportion of Class 2143 moved to private railway and infrastructure companies after leaving the Austrian Federal Railways. That’s not an Austrian peculiarity but a Europe-wide pattern – and it’s extremely relevant for spotters.
| Aspect | At the state railway | After the change of keeper |
|---|---|---|
| Livery | uniform colour scheme | new keeper’s company colours |
| Markings | class number in state-railway style | class number plus keeper marking |
| Typical duties | main-line service, branch lines | construction trains, transfer runs, works traffic |
| Predictability for spotters | via diagrams | via engineering works and contracts |
| Reliable feature | vehicle number | vehicle number |
The one rule that always applies
Liveries, logos and even additional lettering change with every change of owner. The twelve-digit vehicle number stays. Anyone who notes it can identify a machine across decades and several keepers – anyone who only records the colour loses the trail at the first repaint.
Make changes of keeper traceable
With cleanly documented sightings you can see where a machine has turned up over the years.
Placing it within railway operations
Vehicles in their second career follow different rules from vehicles in clock-face service. That fundamentally changes the search strategy.
- Contract-driven rather than timetable-driven. Where a construction machine is standing tomorrow is decided by the construction schedule, not the timetable book.
- Unusual hours. Work under a switched-off overhead line often happens during possession periods, frequently at night or at weekends.
- Unusual places. Sidings, branch lines, construction site areas – not the classic main-line spots.
- Short warning time. Such workings are rarely announced in advance. Anyone who can react sees more than anyone who plans.
Similar conditions partly apply to shunting service. The vehicles typical there, such as Class 2070, are a good benchmark if you want to gauge the proportions of a four-axle main-line locomotive. The modern diesel-electric counterpart is described on the page for Class 2016 Hercules.
Treat everything variable as variable
Keeper, deployment locations, liveries and fleets change constantly. Treat any statement about this as a snapshot and check the current status via your own observation and community sightings.
Documenting sightings so they last
For vehicles with changing keepers, the quality of the note decides whether a sighting is still worth anything in five years.
Record the full number
Not just the class number, but the whole twelve-digit UIC number including the check digit. It's the only lasting identifier.
Take note of the keeper marking
It documents the status at the time of the sighting – and is what makes later changes of keeper traceable at all.
Note the context
Date, time, place and type of working. Especially for construction and special workings, the context is half the information.
Take a reference photo of the markings
A picture of the side wall with a legible number beats any memory. It costs ten seconds and rescues the identification.
How to turn this into an analysable system over time is shown in the guides to keeping a sightings logbook and building your own photo archive. For the location, without exception: only publicly accessible areas. Tracks, operational railway land, construction site areas and stabling groups are closed off and life-threatening.
The practical benefit only shows over time. If you find the same vehicle number two years later at a different place, in a different colour and with a different keeper marking, you’ve documented a verified change of keeper – and from your own observation. Chains like this are exactly the point where collected sightings turn into real knowledge. But they only work if the basic data is complete from the start. A missing number can’t be reconstructed afterwards, a missing date can’t be guessed, and a lost reference photo can’t be replaced.
Common mix-ups
It points to Class 2143 if …
- there's no pantograph, but coolers and an exhaust sit on the roof
- the locomotive has four axles in two two-axle bogies
- the class marking starts with 2143
Look more closely if …
- the machine is running in the company colours of a private keeper
- a keeper marking you don't recognise sits next to the number
- the vehicle is standing in a construction train formation among work equipment
It's not a 2143 if …
- a pantograph sits on the roof
- the class marking starts with 1 – then it's an electric locomotive
- the vehicle is noticeably shorter and has only two or three axles
- a passenger saloon is present – then the class sits in the 5xxx range
In cross-border traffic and on construction workings, vehicles from foreign keepers are an everyday sight in Austria. The country abbreviation next to the number is therefore just as important as the class number – a similar-looking machine doesn’t have to be Austrian.
Verdict
The designation ÖBB Class 2143 reveals more than it shows at first glance: the vehicle type via the first digit, the specific design via the further digits, the origin via the country code, and the current owner via the keeper marking. Anyone who reads these four levels can identify not just this class, but every Austrian traction vehicle.
Quick verdict
Four-digit class number with a leading 2 for diesel locomotive, UIC number with 92 and 81, plus the keeper marking: that's how you identify a 2143 for sure – even once it's long been running in someone else's colours.
Your archive grows with every sighting
Number, keeper, place and date in one place – so every encounter stays useful for analysis, even years later.
Summary
- The designation ÖBB Class 2143 follows a clear system that can be applied to every Austrian traction vehicle.
- After the state-railway era, numerous locomotives moved to private railway and infrastructure companies.
- Clean identification requires the vehicle number and keeper marking, not just the class.
- Anyone who archives sightings systematically can trace changes of keeper over the years.
Frequently asked questions
Why do the ÖBB say "Reihe" and not "Baureihe"?
That's simply the Austrian technical term. The ÖBB designate traction vehicles with the word Reihe (class) and a four-digit number, while Deutsche Bahn speaks of Baureihen with three-digit numbers. In substance both systems do the same job: they assign vehicles to a type.
What does the number 2143 tell you?
The leading 2 marks a diesel locomotive. The further digits stand for the specific type. Following the same pattern, 1xxx is an electric locomotive, 4xxx an electric railcar or multiple unit, and 5xxx a diesel multiple unit. This lets you roughly place any Austrian class designation straight away.
What is a keeper marking?
A letter combination next to the twelve-digit vehicle number that identifies the vehicle's keeper. Together with the country code, it reveals who owns a locomotive today. For vehicles that moved to private companies after the state-railway era, this is the crucial extra piece of information.
How do I read the UIC number of an Austrian diesel locomotive?
It's twelve digits long. At the start is the type code – typically 92 for diesel locomotives – followed by the country code 81 for Austria. After that come the type and serial number plus a check digit. The number stays valid even once the livery and lettering have long since changed.
Why do retired locomotives change keeper?
Because a robust locomotive is still technically usable for a long time even when it's no longer economical for state-railway operation. Construction and infrastructure companies as well as private railways have different requirements: lower mileages, different duty profiles. For them, such machines are often the right solution.
Where do you encounter these vehicles today?
Mainly where no overhead line is available or usable: on non-electrified lines, in construction and maintenance service, and on sidings. Specific deployment locations depend on contracts and engineering works and change constantly – older inventory lists don't help here.
How do I properly document vehicles that have changed keeper?
Always with the full vehicle number, keeper marking, date, place and, if possible, a photo of the markings. Only that way does a sighting stay traceable years later. Livery and company logo alone aren't enough, because they can change with every change of owner.
Is Class 2143 the same as the ÖBB 2143?
Yes, it's the same vehicle class – just written differently. In practice you'll come across both spellings. For identification, only the four-digit number is relevant, not the way it's noted in texts and lists.
Log your sighting of the ÖBB Class 2143
Date, location and vehicle number logged in seconds – and visible to the community.
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ÖBB Class 2143
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