The reference for locomotives and railcars


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Prussian T 33
German Reichsbahn class 990
Germany | 1908 | 13 produced
Die Lokomotive, December 1935

The class T 33 locomotives comprise four small batches of a total of 13 narrow-gauge locomotives that were developed for the Feldabahn between Dorndorf and Kaltennordheim in Thuringia. This route was in the Grand Duchy of Saxe-Weimar-Eisenach, but since the Prussian State Railways had taken over as many railways as possible in the small Thuringian area towards the end of the nineteenth century, the development and procurement of the T 33 was also carried out under Prussian direction. However, a local company, the Christian Hagans machine works in Erfurt, was commissioned to manufacture the machines.

The design of T 3 was used in many places, because so many parts of this tank locomotive, which was procured in very large numbers, could be reused at low cost. Thus, the first series from 1908 in particular looked very similar to its model, but was a bit lighter. Another difference to the T 3 was the Heusinger valve gear, which at the time of development had prevailed on almost all new locomotives. A saturated engine was used, which simplified the maintenance of the locomotives at the expense of economy.

In the second batch from 1912, the weight was increased by around 5.5 tonnes with roughly the same power in order to have a larger adhesive mass available. In addition, the grat area was increased a little. Two further, almost identical batches of two and four pieces each were delivered in late 1912 and 1914. In addition to a different arrangement of some assemblies, they had a larger evaporation heating surface.

Variantfirst batchsecond batchthird and fourth batch
Built190819121912, 1914
Axle config0-6-0T (Six-coupled) 
Gauge3 ft 3 3/8 in (Meter gauge)
Dimensions and Weights
Length23 ft 9 7/16 in25 ft 1 15/16 in
Wheelbase7 ft 4 9/16 in
Fixed wheelbase7 ft 4 9/16 in
Empty weight40,785 lbs50,706 lbs49,824 lbs
Service weight53,087 lbs65,477 lbs
Adhesive weight53,087 lbs65,477 lbs
Water capacity793 us gal
Fuel capacity2,205 lbs (coal)
Power sourcesteam
Indicated power207 hp (154 kW)212 hp (158 kW)
Optimal speed9 mph11 mph
Top speed19 mph
Starting effort14,444 lbf12,839 lbf
Power Plant
Driver diameter34.4 in
Boiler pressure174 psi
Expansion typesimple
Cylinderstwo, 13 3/4 x 17 11/16 intwo, 13 3/4 x 15 3/4 in
Grate area9.3 sq ft9.7 sq ft
Firebox area41 sq ft35.7 sq ft
Tube heating area508.2 sq ft
Evaporative heating area549.2 sq ft543.9 sq ft
Total heating area549.2 sq ft543.9 sq ft
Calculated Values
steam locomotive
tank locomotive
narrow gauge
secondary line
last changed: 01/2022

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