Gmeinder D 25 B

Updated: August 2026 – Two axles, one cab, a short bonnet: the Gmeinder D 25 B belongs to the smallest class of shunting vehicles. Locomotives like this appear in no timetable and rarely carry a class number – but their type designation reveals surprisingly much. This page shows you how to read it and how to classify the vehicle reliably in the field.

What is the Gmeinder D 25 B?

The D 25 B is a two-axle diesel small locomotive from the manufacturer Gmeinder & Co. of Mosbach in Baden. It’s built for simple shunting tasks: moving individual wagons or short groups, on tight works tracks, at low speed.

The type code translates directly. The D stands for the diesel drive, the B at the end for the wheel arrangement – two powered axles in a rigid frame. The figure in between places the machine within a size or power class in the works range. That means you already know how many axles it has and how it’s driven before you’ve even had a first look at the vehicle – more than a plain class number would tell you.

The German small-locomotive system as an identification aid

Small locomotives are historically their own vehicle category in Germany with their own logic. They were ordered by power groups, and this classification still helps you place a vehicle correctly today.

The basic sequence for identification is explained in the guide to identifying classes. Comparable small locomotives from other manufacturers can be found at the DIEMA DVL 150 and the LKM Ns 2.

Classification: why the 98 comes before the number

In the twelve-digit vehicle number, the first two digits state what kind of traction vehicle it is. For diesel vehicles there are two groups – and the difference separates exactly the two worlds meeting here.

Feature	Small locomotive / shunting locomotive (code 98)	Diesel mainline locomotive (code 92)
Axle count	Two to three	Four to six
Speed	Low, designed for shunting	Medium to high
Location of use	Works, connecting and station tracks	Open line
Naming	Manufacturer type, often without a class number	Class number
Unique identifier	Builder’s plate and works number	Fleet and UIC number

This split is the reason you find hardly any solid public data on small locomotives: vehicles that never run on the network need no registration – and accordingly turn up nowhere. Preserved examples are most accessible to the public at light-railway and heritage lines such as the Brohltal-Eisenbahn.

Spotting and photography with small locomotives

Small locomotives are underrated photographically. They often stand still, are completely visible in one shot, and show more mechanics than any cladding on a modern multiple unit.

• Side view first. Two axles, frame, bonnet and cab together give the vehicle its character.
• Photograph the builder’s plate separately. It’s small and often only legible at an angle. Plan a dedicated shot for it.
• Note the coupling and buffers. They reveal whether the locomotive can be coupled to standard vehicles or only works with the operator’s own wagons.
• Note the condition. Operational, stored, restored or a memorial – with this group, that changes fast.
• Take in the surroundings. Loading point, works gate or engine shed tell you what the machine was there for.

What a logbook that captures such changes rather than hiding them looks like is covered in the guide to keeping a sighting logbook.

Which distances apply and why they’re not a matter of discretion is covered in the article on safe distances at the track.

The small-locomotive letters and what they mean

In Germany, small locomotives developed their own naming vocabulary that still appears in vehicle lists and museum plaques today. Anyone who knows it also understands old markings and collection registers.

• K comes first and simply means small locomotive.
• b marks battery-electric drive – vehicles like this run without a combustion engine.
• ö stands for the oil engine, meaning the diesel engine.
• f points to a fluid transmission, meaning hydraulic power transmission.
• The appended power group places the vehicle in a size class – from the smallest machines for individual wagons to more powerful types for whole groups.

This scheme comes from the state railway world, but it also helps when classifying industrial vehicles, because it reflects the same way of thinking: drive type first, then power transmission, then size class. That’s exactly how the Gmeinder type code is built too – D for the diesel drive, then the class figure, then the wheel arrangement.

Laying these two systems side by side makes clear why small locomotives are so hard to identify from their silhouette alone: manufacturers solved the same tasks with the same means and built accordingly similar vehicles. A direct comparison is worthwhile with the Gmeinder 190 PS / D 35 B from the same works range.

Common mix-ups

Verdict

The Gmeinder D 25 B shows how much a type designation can hold: drive type, wheel arrangement and size class in three characters. What it doesn’t deliver is the identity of the individual vehicle – for that you need the builder’s plate. Anyone who combines both and notes the condition too documents a vehicle group about which there’s otherwise hardly any reliable information.