LKM Ns 1

Updated: August 2026 – A tiny vehicle on a track that barely looks wider than a wheelbarrow rut: the LKM Ns 1 is among the smallest diesel locomotives ever built in Germany. This page shows why the gauge is the first identifying step with vehicles like this – and how to judge it reliably in the field.

What is the LKM Ns 1?

The LKM Ns 1 is a small diesel locomotive for narrow-gauge track, built by Lokomotivbau Karl Marx in Babelsberg. It belongs to the Ns type series, which groups together the manufacturer’s narrow-gauge small locomotives; the trailing digit distinguishes the successive types within the series.

Operationally, this is a completely different world from standard-gauge running. Vehicles in this size class move light wagons over short distances – on light railways, works sites, in brickworks, peat workings and gravel pits. In the twelve-digit vehicle number, such a vehicle would carry the type code 98 for diesel shunting and small locomotives; many narrow-gauge vehicles, though, carry no number under this scheme at all, because they were never registered on the public network. Machines like this survive mainly with light railway societies such as the Historische Feldbahn Dresden (Dresden Historic Light Railway), which still demonstrates operation on 600-millimetre gauge today.

Working out the gauge: the first step

Anyone trying to identify a small locomotive first needs to know which system they’re even looking in. A vehicle on 600-millimetre gauge simply cannot be a standard-gauge locomotive – which rules out the vast majority of all types straight away.

Once the gauge is settled, identifying the manufacturer via the builder’s plate follows. How to work through features in a sensible order is described in the guide to identifying rolling stock. If the vehicle carries a twelve-digit number, the article on the UIC number and its check digit helps.

Where it fits into railway operation

The Ns types cover the lower end of diesel operation. They’re built for short runs, light loads and tight curve radii – not for main-line duties. That has clear consequences for watching and photography. Sightings are therefore only really plannable on running days, such as those offered by the Frankfurter Feldbahnmuseum (Frankfurt Light Railway Museum) and comparable societies.

Operating environment	Likelihood of encountering it	What to bear in mind
Light railway museum on a running day	high	check running days in advance, respect the society’s house rules
Heritage and museum railway in winter	low	vehicles often in storage and not visible
Active industrial or quarry railway	medium	private property, access only with permission
Static memorial or exhibition display	high	the vehicle is fixed in place, so no operating shot is possible
Public rail network	very low	vehicles of this type practically never run there

Other vehicles in the series are the LKM Ns 2 and the LKM Ns 3; a standard-gauge vehicle from the same manufacturer is the LKM V 10 C. Comparing the Ns and V types side by side is about the most vivid lesson in track gauges you can get.

Photography on narrow-gauge sites

Small vehicles call for a different approach than a main-line locomotive at a platform. The camera position matters most of all.

• Low viewpoint. Shot from eye level, you’re looking down onto the roof – the vehicle looks squat and unimpressive. Roughly level with the cab windows, the proportions work.
• Three-quarter view rather than a side shot. With very short vehicles, an angled view shows length and width at once and avoids a flat silhouette.
• Include the surroundings. Track panels, skips and loading points tell you more about the operation than an isolated vehicle.
• Details of the builder’s plate. An extra close-up makes the identification verifiable later.

The technical basics – exposure, focus plane, panning – are covered in the guide to taking good photos of trains. For running days in sheds and under a low sun, the article on camera settings in difficult light is worth reading too.

What light railways were built for

To understand why vehicles like the Ns types existed at all, it helps to look at the job they did. Light railways sprang up wherever material had to move short distances and a standard-gauge railway would have been too much effort: in brickworks and clay pits, in peat-extraction areas, gravel and sand pits, sugar factories, on construction sites and in industrial plants.

The advantage of the narrow track is obvious. It needs less space, tighter curves are negotiable, the permanent way is lighter and can be laid and lifted again in prefabricated track panels. As the workings advance, the track simply moves along with them. The vehicles are built for exactly this: small, light, robust and free of sensitive technology.

That’s where the design you see in the Ns 1 comes from. A short frame with few axles, a simple drive, a body that mainly protects the engine, and a cab that often consists of little more than a seat, weather protection and controls. Comfort was never a design criterion – serviceability under rough conditions was.

As the classic extraction industries declined and switched to lorries, most of these railways disappeared. What survived moved into museums and society collections – or into niches where light railway technology still makes sense today, such as tunnelling. For spotters that means these vehicles are no longer an everyday sight, but a destination you have to seek out. Anyone interested will usually find the matching wagons, skips and track panels at light railway museums too – and with them the operational context that a single vehicle standing in the open lacks.

Common mix-ups

In short

The LKM Ns 1 can’t be identified the way a main-line locomotive can. There’s no class number on the front, and rarely a twelve-digit vehicle number. Instead, you work from the outside in: first the gauge, then the manufacturer via the builder’s plate, then the type stage. Anyone who keeps to this order gets surprisingly far with light railway vehicles – and avoids the typical misidentifications.