Krauss-Maffei M 400 C

Updated: August 2026 – Three axles, one continuous frame, and rods that visibly move along as it moves off: that’s the picture a Krauss-Maffei M 400 C presents in works railway service. This page shows what the type name reveals, how to read the power transmission from the outside, and what to keep in mind when observing and photographing it.

What is the Krauss-Maffei M 400 C?

The Krauss-Maffei M 400 C is a three-axle diesel shunting and works locomotive from the type programme of the Munich manufacturer, whose locomotive works in Allach passed to Siemens Mobility in 2001. It belongs among the vehicles that carry type code 98 in the UIC numbering system: diesel shunting and industrial locomotives, clearly set apart from main-line machines with code 92.

Like almost all industrial locomotive type names, this one is built to be legible: the number denotes the power class in hp, the appended capital letter the wheel arrangement. A C stands for three coupled axles in a rigid frame – the standard solution wherever tight curves and heavy individual wagons come together. The same logic applies to the Krauss-Maffei M 500 C and to competing products such as the MaK 450 C.

Coupling rods and jackshaft: the decisive detail

For three-axle shunters, what decides the design isn’t the shape of the body but the question of how the engine power is spread across three axles. There are two fundamentally different routes for that, and both can be recognised from the outside.

A common mistake: assuming rods are a sign of great age. That’s not true. Rod drive was built for works locomotives because it’s unaffected by dirt, frost and hard shunting work. It tells you something about the construction, not the year of build. For the age, you need the builder’s plate.

What the design means for operation

Three-axle shunters with a rigid frame are a compromise: compact enough for tight works tracks, heavy enough for decent starting tractive effort. That produces a typical usage profile.

Feature	Three-axle C shunter	Four-axle BB shunter
Running gear	rigid frame, all axles coupled	two pivoting powered bogies
Tight curves	well suited, short wheelbase	depends on bogie spacing
Typical task	shifting wagon groups within a works	heavy transfers, long wagon groups
Visible rods	common	rare
Usual setting	works railway, private siding	port, steel works, transfer yard

For observers that means: if you’re after C-type locomotives, look at smaller private sidings and works premises, not at large marshalling yards. How to observe there sensibly and safely is described in the guide to marshalling-yard spotting — the basic rules also apply at the edge of an industrial estate.

Observing, photographing, documenting

Shunting areas are among the most dangerous places in railway operation. Vehicles are moved there without announcement, often pushed, without signals and without a fixed timetable. Parked wagons can start moving without warning.

For documentation, one simple rule applies: works number beats livery. Owner, paint and markings change regularly on industrial locomotives, the works number stays. Two photos are enough – a side view for axle count and drive type, a close-up of the builder’s plate for the identity. How to build a permanently usable collection from this is shown by the guide to the sighting logbook; the system behind identification is explained in Identifying train classes.

Why there are so few figures for these locomotives

Anyone researching a state railway class finds production figures, years of build, power ratings and deployment lists. With industrial locomotives it’s different – and for systematic reasons.

• No uniform specification. Every order was an individual decision by a business, not a series procurement with a public tender.
• No public passenger or freight service. Vehicles that never leave a works site never appear in any timetable or diagram plan.
• Many changes of owner. Used shunters are sold, leased and rebuilt; every stage changes markings and appearance.
• Undocumented rebuilds. Workshops swap engines, cabs and equipment without a new type designation resulting from it.

For you as an observer, that’s not a drawback but an opportunity: your own dated sighting is often the best available source for these vehicles. Comparing with other types in the same size class – such as the Henschel DH 440 – helps distinguish series features from one-off builds.

It’s therefore important to keep a clean separation between observation and assumption. What you’ve seen yourself – axle count, rods, builder’s plate, markings – you write down as observation. Everything you derive from it, you mark as inference. That distinction sounds pedantic but keeps your notes usable even years later, once you no longer remember the situation in your head.

Common mix-ups

Conclusion

The Krauss-Maffei M 400 C is a good example of how far you can get even without a data sheet. Axle count, frame type and the question of coupling rods lead in a few seconds to a solid identification, and the builder’s plate delivers the unambiguous identity. Everything that comes after – owner, colour, location – is a snapshot.