Key takeaways
- The type designation M 500 C gives the power class in hp and the wheel arrangement – three coupled axles in a rigid frame.
- The builder's plate is the real identity of an industrial locomotive: manufacturer, type, works number and year of build all in one place.
- The owner's fleet numbers are fleeting, while the works number stays the same through sales, rebuilds and repaints.
- The UIC type code 98 marks diesel shunting and industrial locomotives, as opposed to 92 for diesel main-line locomotives.
- Location and owner change constantly – every statement about them is a snapshot and should be dated.
Contents
Fact file
| Vehicle type | Diesel shunting and works locomotive |
|---|---|
| Manufacturer | Krauss-Maffei, Munich |
| Type code key | Number = engine power in hp, appended letter = wheel arrangement |
| Wheel arrangement | C – three coupled axles in a rigid frame |
| UIC type code | 98 (diesel shunting and industrial locomotive) |
Identifying features
Is this really the class in front of you?
- Three axles in a rigid frame, no bogies beneath the body
- Builder's plate with manufacturer name, type, works number and year of build – usually on the frame, the cab wall or inside the cab
- Bonnet over the engine bay, compact cab with all-round glazing
- Shunting steps, walkway and handrails on all four corners of the vehicle
- Often additional works markings: the owner's fleet number, locomotive name, works number
- Typical setting: works, port and private sidings or heritage railways, not main-line service
Updated: August 2026 – With main-line locomotives, the class number is enough. With industrial locomotives like the Krauss-Maffei M 500 C, the decisive piece of information instead is a small metal plate on the frame. This page explains the type name, shows you how to find and read the builder’s plate – and why it’s the one piece of data you can rely on across decades.
Found a works number? Secure it right away.
A plate, a date, a location – that's all an industrial locomotive sighting needs to stay valuable for good.
What is the Krauss-Maffei M 500 C?
The Krauss-Maffei M 500 C is a three-axle diesel shunting and works locomotive from the industrial locomotive programme of the Munich manufacturer. In the European numbering system, such vehicles belong to type code 98 – diesel shunting and industrial locomotives – and thus explicitly not among the main-line machines with code 92. Krauss-Maffei’s rail vehicle building passed to Siemens Mobility in the late 1990s – vehicles from the old industrial locomotive programme therefore carry the plate of a manufacturer that no longer exists in this form.
The type name is built in the usual pattern of German industrial locomotive builders: the number denotes the engine power class in horsepower, the appended capital letter the wheel arrangement. C means three coupled axles in a rigid frame. The same way of reading it works just as well for the somewhat smaller Krauss-Maffei M 400 C as for the Gmeinder D 500 C or the Henschel DHG 500 C.
The builder’s plate: the only stable identity
A works locomotive can be sold, repainted, renamed and rebuilt several times over its life. What stays the same throughout is the builder’s plate. It usually states four pieces of information: manufacturer, type designation, works number and year of build.
What number are you actually looking at?
Works number
This is the vehicle's most stable identity. It never changes – note it together with the manufacturer and year of build.
The owner's fleet number
Handy for recognition on site, but fleeting: it disappears at the next change of ownership. Always record it with a date.
European vehicle number
The twelve-digit number for vehicles on the general network. On shunters it usually starts with 98.
How that twelve-digit number is structured in detail, and what the individual digit blocks mean, is explained in the article on the UIC number and its check digit. For industrial locomotives: it’s valuable when present – but it isn’t always present.
Which piece of data is good for what
| Data | Stays constant? | What it’s good for |
|---|---|---|
| Works number | yes | unambiguous identity across the vehicle’s whole life |
| Year of build on the plate | yes | placing the production batch |
| Type designation | mostly | design, power class, wheel arrangement |
| Owner’s fleet number | no | recognition on site, matching to the current operator |
| Livery and markings | no | a timestamp, nothing more |
| European vehicle number | mostly | classifying it as a shunting or main-line vehicle |
Two photos are enough
A clean side view shows axle count, frame type and body. A close-up of the builder's plate provides the identity. Everything else is a bonus – but without these two photos, every sighting stays incomplete.
Plates, numbers, date – all in one place
Enter your finds on the spot, rather than reconstructing them later from shaky phone photos.
Spotting: distance, light and safety
Builder’s plates are small, embossed and often painted matte. From the distance available to you, you’ll need focal length rather than proximity. Which lenses are up to the job, and where cheap telephoto optics reach their limits, is covered by the guide to the best telephoto lens for railway photography.
Never enter shunting areas
In shunting and works areas, vehicles are moved without announcement, without signals and frequently pushed; parked wagons can start moving at any time. Works, port and private sidings are also private property. Observe only from public paths, bridges or platforms.
Because industrial locomotives are rarely out on a schedule, the long-term archive is worth more than the single trip. Anyone who collects works numbers, locations and dates over years builds up an overview that often doesn’t exist publicly at all. How to structure and keep such an archive searchable is described in the guide to a photo archive for spotters.
Builder’s plates in practice: what can go wrong
In theory, the case is clear: read the plate, note the number, done. In practice, several pitfalls get in the way, and it’s worth knowing them before you stand in front of the vehicle.
- The plate is overpainted. On locomotives repainted several times, the embossing disappears under layers of paint. Raking side light often still makes it legible.
- The plate is missing. Original plates get stolen or removed during rebuilds. Some operators replace them with their own markings, which then no longer contain a works number.
- There are several plates. After an overhaul or re-engining, workshops attach their own plates. The original manufacturer’s plate often remains alongside it.
- The number isn’t a works number. Not every embossed number on the frame is a works number; it can also be an inspection number, an overhaul date, or a component identifier.
That’s why it’s worth photographing the whole plate rather than just copying down the digits. A photo can be checked later, a typed-out number can’t. And if you’re unsure, note the number with an explicit question mark – a flagged uncertainty is better than false certainty in the archive.
Raking light instead of flash
Embossed plates become legible with flat side light, because the letters cast shadows. Frontal light irons out exactly that contrast – choose the right time of day rather than more light output.
Common mix-ups
It points to an M 500 C if …
- three axles sit in a rigid frame
- the builder's plate names Krauss-Maffei and a type name with C
- the locomotive is fitted with shunting steps and a walkway
- the operating location is a works, port or private siding
Look more closely if …
- only a painted fleet number is visible
- the vehicle has been rebuilt and carries several plates
- the type designation resembles that of another manufacturer
It is not an M 500 C if …
- the builder's plate names a different manufacturer
- the locomotive runs on two bogies
- the vehicle number starts with 92 – that marks a main-line diesel locomotive
Conclusion
With industrial locomotives like the Krauss-Maffei M 500 C, the path to a reliable identification doesn’t run via colour or markings, but via two things: the legible type logic and the builder’s plate. The type name tells you what kind of vehicle stands before you; the plate tells you which one exactly. Anyone who records both has a sighting that still holds up long after the locomotive has been repainted and sold on.
In brief
Type name for the design, builder's plate for the identity. Always note the fleet number and livery with a date – they're the most fleeting data on the whole vehicle.
Individual finds become a collection
Works numbers, photos and locations pulled together – and you can instantly see which types you're still missing.
Summary
- Krauss-Maffei supplied three-axle shunters as a standard size to industrial and port operators; the type name describes power and running gear.
- Anyone collecting such locomotives works with works numbers rather than fleet numbers, because only the former stay permanently unique.
- A sharp close-up of the builder's plate is the most valuable part of a sighting for industrial locomotives.
- Works premises are private property; every observation must be made from publicly accessible locations.
Frequently asked questions
What does the designation Krauss-Maffei M 500 C mean?
It follows the type scheme of the Munich manufacturer. The number 500 denotes the engine power class in horsepower, the letter C stands for three coupled driving axles in a rigid frame. That describes the locomotive's size and running gear unambiguously, even without any further data sheet.
Where is the builder's plate on a shunter?
Most often on the cab side wall, on the frame below the walkway, or inside the cab. It's usually a metal plate with manufacturer name, type designation, works number and year of build. On locomotives that have been rebuilt several times, additional plates from the workshops that did the rebuild may also be fitted.
What's the difference between a works number and a fleet number?
The works number is assigned once by the manufacturer at delivery and never changes. The fleet number is assigned by the current owner and changes with every change of ownership. For lasting documentation, the works number is therefore always the more reliable reference.
Why do many industrial locomotives not carry a twelve-digit vehicle number?
A European vehicle number is assigned to vehicles that run on the general railway network. Locomotives that work exclusively on an enclosed works site don't need one. As soon as a vehicle crosses from a private siding onto the public network, the number becomes relevant – and for shunters it usually then starts with 98.
How do I photograph a builder's plate sensibly?
As perpendicular to the plate surface as possible, so the embossing doesn't get distorted in perspective. Metal plates reflect strongly – find an angle where no bright surface reflects into the shot. With a telephoto lens, the plate can also be captured legibly from a greater distance on the public path.
Where can you find a Krauss-Maffei M 500 C?
Usually at works railways, private sidings and at heritage or society railways that have taken over withdrawn industrial locomotives. Such areas are almost always private property. Owner and location also change regularly, because used shunters are traded and leased.
Can you infer the year of build from the works number?
Only to a limited extent and only with a reliable manufacturer's list. Works numbers are assigned consecutively but weren't always delivered in strict chronological order. The year of build is usually stated directly on the builder's plate – that's the more reliable source than any estimate.
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 track areas is out of the question. Different standards apply from the public path, but that depends on the individual case – ask beforehand if in doubt.
Log your sighting of the Krauss-Maffei M 500 C
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Related classes
Krauss-Maffei M 400 C
The Krauss-Maffei M 400 C is a three-axle diesel shunter with a rigid frame. Coupling rods and a jackshaft are the number-one feature to look for.
ShunterGmeinder D 500 C
The Gmeinder D 500 C is a three-axle industrial locomotive with a rigid frame. Coupling rods and the wheel-arrangement letter make it identifiable from a distance.
ShunterHenschel DHG 500 C
The Henschel DHG 500 C is a three-axle shunting locomotive with cardan-shaft drive. Its type name follows a pattern you'll find at other manufacturers too.
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ShunterGmeinder 250 PS
Gmeinder 250 PS isn't a class, but a power-output designation for an industrial locomotive from Mosbach. Here's how to identify these vehicles all the same.
ShunterGmeinder D 100 BB
The Gmeinder D 100 BB is a heavy four-axle industrial locomotive from Mosbach. Bogies instead of rods and the 98 in the number place it unambiguously.
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