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German Reichsbahn class 24
Polish State Railways Oi2
Germany | 1928 | 95 produced
24 009 in 1985 in the Bochum-Dahlhausen Museum
24 009 in 1985 in the Bochum-Dahlhausen Museum
Manfred Kopka

The class 24 was one of the few German tender locomotives which were developed directly for use on branch lines. In order to make the best possible use of the advantages of the standard program, it was developed together with the tank locomotive of the class 64. Both locomotives were almost identical except for the water tank on the 64 up to the cab.

In West and East Prussia, the Reichsbahn had an extensive network of branch lines that lay in the flat land and had long distances between stops. However, most tender locomotives could not be used on many of these routes because the axle loads were too high. This is how the 24 was created as a passenger locomotive with a 2-6-0 wheel arrangement, whose maximum axle load was 15 tonnes and which was designed for 90 km/h. With its long range, it quickly gained a reputation as a flat land racer, and it was also nicknamed the “steppe horse”. In comparison to other standard locomotives, the 24 stood out because the boiler was mounted relatively far forward, meaning that the cylinders and chimney were not at the same level. The construction of the chassis could be kept quite simple due to the small number of axles. The mounting of the leading axle in a Bissel frame and weakened flanges on the central coupled axle were sufficient to achieve good running characteristics.

A total of 95 pieces were made, which were delivered between 1928 and 1940. The 24 069 and 070 were designed as medium-pressure machines with a boiler pressure of 25 bar. The former got a two-cylinder compound engine and the latter uniflow cylinders. While the 070 was not convincing at all and was later reverted to the status of the production engines, the 069 achieved the lowest specific steam consumption of all standard locomotives. Due to problems with the higher pressure, both were later only operated at 20 bar.

Compound medium-pressure test engine 24 069
Compound medium-pressure test engine 24 069
Die Lokomotive, January 1936

Since the engines were purchased for the eastern areas of the Reich, 34 units came to the Polish State Railways after the end of the Second World War, which used them until 1976 under the designation Oi2. A larger part of 47 pieces came to the Bundesbahn, where they were all retired between 1960 and 1966. The Reichsbahn received only four engines, three of which had been retired before 1970. The only remaining 24 009 finally got the number 37 1009 and was sold two years later.

VariantProduction variant24 069
General
Built1928-19401932
ManufacturerBorsig, Hanomag, Henschel, Krupp, Linke-Hofmann, SchichauBorsig
Axle config2-6-0 (Mogul) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length55 ft 7 1/2 in
Wheelbase20 ft 8 1/16 in
Fixed wheelbase11 ft 9 3/4 in
Empty weight117,727 lbs117,947 lbs
Service weight128,529 lbs128,970 lbs
Adhesive weight99,208 lbs100,641 lbs
Total weight221,785 lbs222,226 lbs
Axle load33,290 lbs33,620 lbs
Water capacity4,227 us gal
Fuel capacity13,228 lbs (coal)
Power
Power sourcesteam
Indicated power908 hp (677 kW)
Estimated power1,207 hp (900 kW)
Optimal speed20 mph33 mph
Top speed56 mph
Starting effort29,434 lbf23,283 lbf
with start valve27,940 lbf
Power Plant
Driver diameter59.1 in
Boiler pressure203 psi363 psi
Expansion typesimplecompound
Cylinderstwo, 19 11/16 x 26 intwo, HP: 15 3/4 x 26 in
and LP: 23 5/8 x 26 in
Boiler
Grate area22 sq ft22.2 sq ft
Firebox area93.6 sq ft
Tube heating area1,031 sq ft1,026.3 sq ft
Evaporative heating area1,124.6 sq ft1,120 sq ft
Superheater area401.9 sq ft394 sq ft
Total heating area1,526.5 sq ft1,513.9 sq ft
Calculated Values
steam locomotive
passenger
last changed: 01/2022
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