The reference for locomotives and railcars


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Prussian G 9
German Reichsbahn class 5523-24
Germany | 1908 | 200 produced
G 9
G 9
Die Lokomotive, September 1914

Although Prussia had already built a superheated freight locomotive with the G 8 from 1902, they were not yet completely convinced of the superheater technology and thus designed the G 9. The G 7 was used as the basis for the development, but one could now Install a larger boiler due to the meanwhile higher permissible axle loads

Initially the engines were also put into service as the G 7, but the new designation G 9 was soon assigned. This made sense, since the new engines were significantly more powerful than the G 7 due to the larger boiler, a cylinder diameter increased by 30 mm and a weight increased by a little more than five tonnes. Nevertheless, the power remained noticeably below that of the G 8, which in turn demonstrated the power of a locomotive of about the same weight in the superheated version, which was not yet fully developed.

The first ten pieces received internal Allan valve gear, but the rest used the usual external Walschaerts valve gear. Between 1908 and 1911, Schichau and other works produced exactly 200 of these, which were mainly used to transport ore from the North Sea to the Ruhr area. A few years later, only 133 engines came to the Reichsbahn, which were assigned to class 5523-24. Of these, 36 were superheated in the years that followed, bringing them closer to the G 8 in terms of power and speed.

Schematic drawing with dimensions
Schematic drawing with dimensions
Locomotive Magazine, October 1910

After the war, the engines of the former G 9 were used in both parts of Germany, with the exception of a few examples that remained abroad. In the western zones, there was no need for these saturated steam locomotives and they were retired by 1949. This was different in the Soviet occupation zone, which is why the engines were included in the inventory of the Reichsbahn. Road number 55 2361 was the last to be retired there in 1961.

VariantAllan valve gearWalschaerts valve gearsuperheated
Axle config0-8-0 (Eight-coupled) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length54 ft 11 3/4 in
Length loco34 ft 1 3/4 in
Wheelbase14 ft 9 3/16 in
Fixed wheelbase14 ft 9 3/16 in
Empty weight114,971 lbs113,053 lbs
Service weight132,277 lbs128,551 lbs144,403 lbs
Adhesive weight132,277 lbs128,551 lbs144,403 lbs
Total weight205,691 lbs201,745 lbs219,139 lbs
Axle load33,268 lbs32,650 lbs36,156 lbs
Water capacity3,170 us gal
Fuel capacity11,023 lbs (coal)
Power sourcesteam
Indicated power912 hp (680 kW)
Estimated power1,207 hp (900 kW)
Optimal speed17 mph22 mph
Top speed28 mph
Starting effort34,952 lbf
Power Plant
Driver diameter49.2 in
Boiler pressure174 psi
Expansion typesimple
Cylinderstwo, 21 5/8 x 24 13/16 in
Grate area32.9 sq ft37.7 sq ft
Firebox area127.2 sq ft125.9 sq ft
Tube heating area2,026.9 sq ft1,999.5 sq ft1,603.8 sq ft
Evaporative heating area2,154.1 sq ft2,126.7 sq ft1,729.8 sq ft
Superheater area613.5 sq ft
Total heating area2,154.1 sq ft2,126.7 sq ft2,343.3 sq ft
Calculated Values
steam locomotive
last changed: 01/2022

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