Key takeaways
- M 1200 BB is a manufacturer's type designation from Krauss-Maffei's industrial locomotive programme, not a state railway class number.
- The number stands for engine power in hp, the appended capital letters for the wheel arrangement – a scheme used by many German locomotive builders.
- BB means two two-axle powered bogies with four driven axles: the design for heavy shunting and transfer duties.
- The UIC type code 98 marks the vehicle as a diesel shunting and industrial locomotive, as opposed to 92 for diesel main-line locomotives.
- Owner, livery and location change frequently – only the builder's plate and vehicle number are reliable.
Contents
Fact file
| Vehicle type | Heavy diesel shunting and industrial locomotive |
|---|---|
| Manufacturer | Krauss-Maffei, Munich |
| Type code key | Number = engine power in hp, appended letters = wheel arrangement |
| Wheel arrangement | BB – two two-axle powered bogies, all four axles driven |
| UIC type code | 98 (diesel shunting and industrial locomotive) |
Identifying features
Is this really the class in front of you?
- Four axles, distributed over two two-axle bogies – no axles in a rigid main frame
- Box-type body with an off-centre or centred cab and long bonnets
- Large louvred vents on the bonnet sides for engine and gearbox cooling
- Shunting steps, handrails and walkways all round – a typical shunter detail
- Builder's plate with manufacturer name, type, works number and year of build on the frame or in the cab
- Typical setting: works, port and private sidings, not scheduled main-line service
Updated: August 2026 – Four axles, but none of them in a rigid frame: when a bulky diesel shunter stands on two visibly pivoting bogies, you’re looking at a design like the Krauss-Maffei M 1200 BB. This page explains what the type name tells you, how to read wheel arrangements in the field, and how to tell the locomotive apart from similar vehicles.
Spotted an industrial locomotive? Note it straight away.
With works locomotives, owner and livery change constantly – a dated sighting is worth more than any list on the web.
What is the Krauss-Maffei M 1200 BB?
The Krauss-Maffei M 1200 BB is a heavy diesel shunting and industrial locomotive from Munich locomotive building. That works in Allach has belonged to Siemens Mobility since 2001, where locomotives are still built today. The name is not a class designation from a state railway but a manufacturer’s type designation from a sales programme: works, ports and private railways ordered from it whichever size matched their wagon groups.
That’s exactly why the name is so useful. It describes the vehicle technically rather than just numbering it: the number stands for the power class in hp, the appended capital letters for the wheel arrangement. Once you’ve understood this scheme, you can read your way through other manufacturers’ programmes too – from the Henschel DHG 1200 BB to the MaK G 1100 BB.
How to read the type name
Letters at the front: the type series
The leading letter places the locomotive within the manufacturer's type programme. Additional letters mark the power transmission in many designs – for instance H for hydraulic, E for electric.
Number in the middle: the power class
The number denotes engine power in horsepower. It's a programme step, not an exact measured value – two locomotives of the same step can differ in detail.
Letters at the end: the wheel arrangement
B = two coupled axles, C = three, D = four. Two letters together, such as BB, mean two separate powered groups, usually bogies.
This principle is widespread across German industrial locomotive building. If you see an unfamiliar type designation, work through it from back to front: first wheel arrangement, then power, then manufacturer. The general sequence for identification is explained in the guide Identifying train classes.
Reading wheel arrangements: from B to BB
The wheel arrangement is the feature you can capture even from a distance, in poor light and without legible markings. That’s why it comes first in any identification.
| Notation | Meaning | What to look for |
|---|---|---|
| B | two driven axles in a rigid frame | short wheelbase, often a coupling rod between the axles |
| C | three driven axles in a rigid frame | three axles close together, axle boxes in the frame sides |
| D | four driven axles in a rigid frame | long rigid wheelbase, very rare on diesel shunters |
| BB | two two-axle powered groups, usually bogies | two recognisable running-gear assemblies beneath the body |
| B’B’ | like BB, with an apostrophe for pivoting units | notation in the strict UIC style |
The apostrophe in the UIC notation marks that the powered group can pivot relative to the locomotive body. Manufacturer brochures often drop it – that’s a writing convention, not a technical difference. What matters more for you in the field: BB means two running-gear assemblies, C means one continuous frame. You’ll see this difference as soon as you crouch down to axle height or photograph the locomotive from the side.
A memory aid for the first glance
Count the axles first, then the running-gear groups. Four axles in two packages give BB, four axles in a row in the frame give D. Everything else – power, year of build, owner – comes after that.
Where such locomotives stand in railway operation
Four-axle shunters of this size are procured wherever long, heavy wagon groups need to be moved but no main-line approval is required. That produces a clear location pattern.
| Environment | Likelihood of a sighting | Why |
|---|---|---|
| Steel, chemical and power plant railways | high | heavy wagon groups, constant shunting demand |
| Port railways | high | block trains are broken up and re-formed |
| Industrial private sidings | medium | transfer between works and the state railway |
| Public marshalling yards | medium | but dominated there by state railway classes |
| Open line in regular service | low | shunters are not designed for that |
| Heritage and society sites | medium | withdrawn industrial locomotives are often preserved |
This distribution is why industrial locomotives are so hard to document: their operating locations are private property, and their owners change. Anyone who still wants to collect systematically concentrates on transfer points and publicly viewable station edges – the guide to spotting at a marshalling yard describes how to do that safely and legally.
A helpful comparison point here is the state railway side of the same task. Anyone familiar with the four-axle shunters of Class 294 has a sense of how big, how heavy and how equipped a locomotive for transfer duties typically is. Industrial locomotives move in the same size range but are built to customer requirements rather than a uniform specification – which is why two vehicles of the same type series often differ in detail while the basic design stays identical.
What you can realistically expect
For many industrial locomotive types there is no public data sheet, no production figure and no operator list. That’s not a shortcoming in your research but a property of this vehicle class: it was never documented for the public, but built for businesses that simply needed a locomotive.
That leads to a different way of working than with well-known state railway classes:
- Describe rather than look up. What you see – number of axles, running-gear type, body shape, markings – is the most solid information you’ll get.
- Date rather than assert. Every statement about owner, colour or location is a snapshot and should be noted with a date.
- Collect rather than assess singly. Only comparing several examples reveals what is a series feature and what is a one-off build.
- Flag uncertainty. An honestly labelled guess is worth more than a falsely stated certainty.
Anyone who works this way builds up an overview over the years that doesn’t exist publicly anywhere else – and that’s exactly where the appeal of this vehicle group lies.
Collect works numbers properly
Enter type, works number and date on the spot, rather than reconstructing them later from blurry photos.
Spotting and photography: what’s different here
You don’t photograph shunters the way you photograph main-line locomotives. They stand around often, move briefly, frequently change direction – and they operate in an environment that’s dangerous for outsiders.
Shunting areas are particularly dangerous
In shunting and works areas, vehicles are moved without announcement, without signals and frequently pushed. Parked wagons can start moving at any time. Entry is forbidden even where no fence is visible. Stay on public paths and keep your distance – the rules are summarised in the article on the safe distance from the track.
In practice that means: find a spot on a public road, a bridge or a platform with a clear view of the transfer track. Photograph the locomotive as much as possible from the side, so the wheel arrangement and the builder’s plate position are both in frame. And plan for the light – between works buildings and gantry cranes it’s almost always either harsh or absent altogether. For the technique behind it, it’s worth looking at good photos of trains.
Common mix-ups
It points to a BB shunter if …
- you count four axles in two recognisable running-gear groups
- no coupling rods run between the axles
- the locomotive carries shunting steps, handrails and shunting radio aerials
- the builder's plate shows an industrial locomotive type name rather than a class number
Look more closely if …
- the locomotive is freshly painted and the markings don't match the builder's plate
- it carries a twelve-digit vehicle number – then check the first two digits
- the body has been rebuilt afterwards, for instance with a new cab
It is not a BB locomotive if …
- you see three axles in a single continuous frame – that would be C
- coupling rods link all the axles – then a rigid frame is present
- the vehicle number starts with 92 – that marks a main-line diesel locomotive
Conclusion
The Krauss-Maffei M 1200 BB stands in for an entire vehicle class that is rarely documented and yet readily identifiable. The type name delivers the power class and wheel arrangement, the running gear confirms it, and the builder’s plate makes the individual machine unambiguous. Everything else – colour, markings, location – is movable and should never be the basis of an identification.
In brief
Four axles in two bogies, shunting equipment, a manufacturer's type plate: that's the picture of an M 1200 BB. Read the type name back to front, and rely on the builder's plate and vehicle number rather than the livery.
Your industrial locomotive sightings in one place
Type, works number, date and location in one app – so a collection builds up over time that exists nowhere else.
Summary
- Krauss-Maffei built a broad range of shunting and industrial locomotives in Munich over decades, with systematically structured type names.
- For the M 1200 BB, the name gives two solid features: the power class and a four-axle running gear on two bogies.
- The wheel arrangement notation is the fastest entry point for identifying such locomotives – it can be read from twenty metres away.
- Vehicles of this kind stand almost always on private premises; document them only from publicly accessible locations.
Frequently asked questions
What does the designation Krauss-Maffei M 1200 BB mean?
It comes from Krauss-Maffei's type programme. The number 1200 denotes the engine power class in horsepower, the appended letters BB the wheel arrangement: two two-axle powered bogies with four driven axles in total. The leading letter identifies the type series within the manufacturer's programme.
What's the difference between BB and D in a wheel arrangement?
BB stands for two separate two-axle powered groups, usually in bogies. D stands for four coupled axles in a single rigid frame. Both locomotives have four driven axles, but the running gear is fundamentally different – and that's exactly what you see from the outside straight away.
Why do shunters carry the type code 98 and not 92?
The twelve-digit European vehicle number begins with a type code for traction vehicles. 92 marks diesel main-line locomotives, 98 marks diesel shunting and industrial locomotives. What decides is the vehicle's purpose and approval, not its age or appearance.
How do I reliably tell bogies apart from a rigid frame?
Look at where the axle boxes sit. On bogies, axles, springs and frame form a separate assembly that pivots beneath the locomotive body and is clearly recognisable as a unit. On a rigid frame, the axle boxes sit directly in the frame sides of the locomotive body, often with visible axle guards and, on rod-driven locomotives, with coupling rods.
Where can you find such a locomotive?
Anywhere heavy wagon groups are moved: at works railways, port railways, in steel and chemical plants and on private sidings. These areas are almost always private premises. Owner and location also change regularly, because used industrial locomotives are sold and leased.
How do I identify a single locomotive of this type reliably?
Via the builder's plate with manufacturer, type, works number and year of build, and via the vehicle number on the frame if one has been assigned. The works number is the most stable identity for industrial locomotives, because livery, markings and owner can change several times over the decades.
Am I allowed to photograph on works premises?
Works, port and private sidings are private property. Photography there is only permitted with the operator's permission, and entering the track area is off limits in principle. The situation from a public path is different, but depends on the specific case – ask beforehand if in doubt.
Is the M 1200 BB comparable to a main-line diesel locomotive?
Visually to some extent, operationally not. Shunting and industrial locomotives are designed for high starting tractive effort at low speed, main-line locomotives for continuous output and speed. The gear ratio, cab layout and shunting-step equipment differ accordingly.
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