Class 50

Updated: August 2026 – Five coupled axles, one leading axle at the front, two cylinders, and a surprisingly low axle load: Class 50 is the most successful German freight steam locomotive. 3,164 locomotives were built in Germany alone between 1939 and 1948. This page shows you how to identify it, why its very lightness made it so valuable, and how you can find one of the many surviving locomotives today.

What is Class 50?

Class 50 is a freight tender locomotive with the wheel arrangement 1’E and two cylinders, built between 1939 and 1948. 3,164 locomotives were built in Germany, with a further 286 built under licence in Romania. Maximum speed was 80 km/h.

Its real secret to success lies not in its power, but in its axle load of around 15.2 t. Heavy freight locomotives were not allowed on lightly built lines – the 50 was. As a result, it developed from a pure freight workhorse into an all-rounder that, by the end of the steam era, was also hauling passenger trains on branch lines. After the computer-era renumbering of 1968, the Deutsche Bundesbahn listed it under classes 050 to 053. None still run in regular service today; works such as the Dampflokwerk Meiningen keep operational locomotives within their boiler certificate deadlines.

Why the low axle load changed everything

Axle load is not a minor detail on steam locomotives – it is the criterion that decides where a class can be used. Every line is built to a particular route class, which limits how much weight a single axle may put on the track.

The maths is simple: five driven axles spread the locomotive’s weight across many points, which lowers the individual axle load without reducing tractive effort. This is exactly what set the 50 apart from the heavier Class 44, which could produce more power but remained restricted to main lines built to carry it.

Classification in railway service: one class, three lines of development

Several variants developed over time from the base design, and they are worth telling apart.

Variant	Who converted it	Distinguishing feature	Status today
Class 50 (base design)	–	1’E h2, axle load around 15.2 t	numerous museum locomotives survive
Class 050–053	Deutsche Bundesbahn from 1968	pure computer-era renumbering, technically unchanged	historical designation
Class 50.35	Deutsche Reichsbahn, 1957–1962	new boiler of the 50E design, more power	many locomotives survive
Class 50.40	Deutsche Bundesbahn, 1954 and 1958–1959	Franco-Crosti preheater boiler with side-mounted chimney	no locomotive survives

The comparison is worthwhile because it shows how differently the two railway administrations handled the same base vehicle. East Germany’s rebuilt Class 50.35 became a success and still shapes heritage operation today. West Germany’s Franco-Crosti Class 50.40 locomotives, by contrast, remained a short-lived episode.

Spotting: the most realistic steam locomotive for sightings of your own

Because so many locomotives of the 50 and its derivatives survive – for example at the Bavarian Railway Museum – your chances of an actual encounter are higher than with most other steam classes. Even so: there is no timetable, only research routes.

The guide on special trains and special workings explains how to reliably track down special workings. If the special train calls at a major hub station, it’s worth checking the overview of the best stations for trainspotting, which lists dwell times and platform lengths. Steam-specific photography technique is covered in the guide how to photograph steam trains.

One point many people underestimate: heritage locomotives are deliberately restored to represent particular eras. The same locomotive may therefore appear at times as 50 xxxx with Reichsbahn markings, at other times as 052 xxx with Bundesbahn markings – depending on which period the operating society, such as the Dampfbahn Fränkische Schweiz, wants to portray. This makes no difference for identifying the class, but it matters a great deal for accurate documentation. Always note the number that actually appears on the vehicle.

The tenders behave similarly. Because locomotive and tender have been swapped several times over the decades, the pairing does not necessarily match the as-delivered condition. A trough tender on a Class 50 is therefore not a contradiction but simply everyday practice – and serves neither as proof nor as a reason for exclusion.

Common mix-ups

The distinction from Class 52 is the hardest: both are two-cylinder 1’E locomotives. Here it helps to look at the build – the 52 is noticeably more austere as a wartime locomotive – and, in the end, the running number.

Conclusion

Class 50 is proof that the best locomotive does not have to be the most powerful. Five coupled axles, two cylinders and a low axle load produced a vehicle that was allowed to run almost everywhere – and was therefore built in numbers hardly any other German steam locomotive reached. For spotters, it remains today the most realistic opportunity to experience a large steam locomotive under steam.