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Army Field Railway Brigadelokomotive
German Reichsbahn class 99331, Polish State Railways Tx1 and Tx2, Hungarian State Railways class 498 and Lithuanian series K4
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Germany | 1903
2,573 produced
Brigadelokomotive built by Hartmann in Chemnitz on a postcard
Brigadelokomotive built by Hartmann in Chemnitz on a postcard
Brück & Sohn Kunstverlag Meißen

The Brigadelokomotive was a 0-8-0T tank locomotive built for the German military field railways with a gauge of 600 mm (nearly two feet). It was designed at the beginning of the 20th century when it became evident that the 0-6-0+0-6-0T “Zwilling” was not powerful enough anymore. The first prototype was completed by Henschel in 1903, followed by a low volume production starting in 1905.

The locomotives had outside frames, outside cylinders and outside Stephenson valve gear. To enable running through tight curves, the first and last axles were Klien-Lindner hollow axles which could be adjusted radially. Later these were exchanged for conventional axles with weakened wheel flanges, what allowed to increase the top speed from 15 to 25 km/h. With an indicated power of 65 hp, they could haul 70 tonnes with 15 km/h. Due to the limited water capacity of 1,100 liters, additional tenders were built with a capacity of up to 5,000 liters of water and 1.2 tonnes of coal.

Large-scale production only started in World War I, but at a large number of manufacturers. When production was completed in 1919, more than 2,500 had been built. With 789, the largest number had come from Henschel. Second and third were Borsig with 377 and O&K with 359. After the end of the war, they came to a large number of civil operators in many countries. Today, around 100 are still existing all around the world.

General
Built1903-1919
ManufacturerBMAG, Borsig, Esslingen, Hanomag, Hartmann, Henschel, Hohenzollern, Humboldt, Jung, Krauss, Linke-Hofmann, Maffei, O&K, SACM, Vulcan
Axle config0-8-0T (Eight-coupled) 
Gauge1 ft 11 5/8 in
Dimensions and Weights
Length19 ft 3 11/16 in
Wheelbase7 ft 5 in
Rigid wheelbase7 ft 5 in
Empty weight21,385 lbs
Service weight26,455 lbs
Adhesive weight26,455 lbs
Axle load6,614 lbs
Water capacity291 us gal
Fuel capacity1,543 lbs (coal)
Boiler
Grate area4.5 sq ft
Firebox area16.1 sq ft
Tube heating area160.4 sq ft
Evaporative heating area176.5 sq ft
Total heating area176.5 sq ft
Power Plant
Driver diameter23.62 in
Boiler pressure218 psi
Expansion typesimple
Cylinderstwo, 9 7/16 x 9 7/16 in
Power
Power sourcesteam
Indicated power64 hp (48 kW)
Optimal speed6 mph
Top speed16 mph
Starting effort6,606 lbf
Calculated Values
steam locomotive
narrow gauge
tank locomotive
field railway
military railway
last changed: 01/2025
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