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Prussian T 91
German Reichsbahn class 900-2
Germany | 1892 | 426 produced
T 9<sup>1</sup> built by Hohenzollern
T 91 built by Hohenzollern
Die Lokomotive, June 1924

Under the designation T 9, the Prussian State Railways combined various types of tank locomotives with three coupled axles and one leading or trailing axle. They were mainly be used for tasks for which the T 3 was too weak. Originally 57 engines were built from 1891 for different lines with small differences. While the later T 92 and T 93 had a leading axle, the original T 9 and T 91 had a trailing one.

After the T 9 was based on a design by Krauss in Munich, a large number of it's development T 91 were ordered from various manufacturers in Prussia. The weight and dimensions increased only slightly, but the diameter of the coupled wheels was increased to 1,350 mm. Thus, the maximum permitted speed could be at 60 km/h. The state railway variants of the T 9 were only certified for 45 or 50 km/h, only the Hessian locomotive was also permitted for 60 km/h.

Cöln 7270 in September 1982 in Bochum-Dahlhausen, one of the last engines preserved and scrapped by now
Cöln 7270 in September 1982 in Bochum-Dahlhausen, one of the last engines preserved and scrapped by now
MPW57

A total of 426 engines were built up to 1901, of which 231 came to the Reichsbahn in 1925 and were mostly assigned to the 900-2 class. Ten pieces were incorrectly labeled as the 91 class, which was actually intended for the T 92 and T 93. Like their predecessors, most of the T 91 were retired by around 1930 and some were sold to private railways. During the Second World War, some engines came back from Poland, the last of which survived until 1953.

General
Built1892-1901
ManufacturerBorsig, Hanomag, Union Königsberg, Hohenzollern, Grafenstaden, Henschel, Schichau
Axle config0-6-2T (Webb) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length37 ft 10 3/16 in
Wheelbase20 ft 0 3/16 in
Fixed wheelbase12 ft 1 11/16 in
Empty weight95,240 lbs
Service weight119,049 lbs
Adhesive weight91,933 lbs
Axle load30,865 lbs
Water capacity1,532 us gal
Fuel capacity3,307 lbs (coal)
Power
Power sourcesteam
Indicated power444 hp (331 kW)
Optimal speed14 mph
Top speed37 mph
Starting effort19,780 lbf
Power Plant
Driver diameter53.2 in
Boiler pressure174 psi
Expansion typesimple
Cylinderstwo, 16 15/16 x 24 13/16 in
Boiler
Grate area16.5 sq ft
Firebox area78.1 sq ft
Tube heating area1,081.8 sq ft
Evaporative heating area1,159.9 sq ft
Total heating area1,159.9 sq ft
Calculated Values
steam locomotive
freight
tank locomotive
last changed: 04/2022
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