The reference for locomotives and railcars


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Imperial-Royal State Railways and Austrian Southern Railway class 170
Austrian Federal Railways class 56, Czechoslovak State Railways class 434.0, Italian State Railway class 729 and Polish State Railways Tr11
Austria-Hungary | 1897 | 850 produced
Die Lokomotive, August 1917

Although the class 170 of the kkStB with the 2-8-0 wheel arrangement appeared to be a freight locomotive, it was developed by Gölsdorf for the increasingly heavier passenger trains on the Arlberg Railway. It had two connected steam domes and two compound cylinders. The second and fourth driving axles could be moved laterally for better running characteristics.

Especially during the First World War, the 170 was indispensable in freight transport. It achieved the highest number of all Austrian steam locomotives and the Südbahn also ordered 54. After the war, the ČSD even had more manufactured and now had a total of 374. Of these, 345 were superheated and simpled, which led to the renumbering from class 434.0 to 434.2. The BBÖ had 228, which retained the Reichsbahn's class number 56 after the Second World War.

ManufacturerWiener Neustadt, StEG, Floridsdorf, BMMF, Breitfeld & Daněk, Krauss Linz, Škoda
Axle config2-8-0 (Consolidation) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length57 ft 2 1/8 in
Wheelbase22 ft 3 11/16 in
Fixed wheelbase9 ft 2 1/4 in
Total wheelbase44 ft 6 13/16 in
Empty weight133,380 lbs134,482 lbs
Service weight151,016 lbs152,119 lbs
Adhesive weight125,663 lbs127,868 lbs
Axle load31,416 lbs31,967 lbs
Water capacity4,412 us gal
Fuel capacity15,873 lbs (coal)
Power sourcesteam
Estimated power1,006 hp (750 kW)1,140 hp (850 kW)
Optimal speed28 mph29 mph
Top speed37 mph
Starting effort23,072 lbf24,994 lbf
with start valve27,686 lbf29,993 lbf
Power Plant
Driver diameter49.5 in
Boiler pressure174 psi188 psi
Expansion typecompound
Cylinderstwo, HP: 21 1/4 x 24 7/8 in
and LP: 31 1/2 x 24 7/8 in
Grate area36.2 sq ft42.1 sq ft
Firebox area150.7 sq ft153.9 sq ft
Tube heating area2,540.3 sq ft
Evaporative heating area2,691 sq ft2,694.2 sq ft
Total heating area2,691 sq ft2,694.2 sq ft
Calculated Values
steam locomotive
Karl Gölsdorf
last changed: 10/2023

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