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Imperial-Royal State Railways class 270
Czechoslovak State Railways class 434.1, Polish State Railways Tr12, Romanian Railway class 140, Austrian Federal Railways class 156, Italian State Railway class 728 and Yugoslav Railway class 25
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Austria-Hungary | 1917
574 produced
CSD 434.1100 in 2005 in the Lužna u Rakovníka Railway Museum
CSD 434.1100 in 2005 in the Lužna u Rakovníka Railway Museum
Rainer Haufe

The kkStB class 270 was a 2-8-0 freight locomotive, developed as a superheated variant of the class 170. The actual design work was carried out by BMMF which would later be situated in Czechoslovakia. As usual for Austrian locomotives of the time the superheater surface was relatively small, but the two interconnected domes of the 170 had now been interchanged for a single dome. In result, the class 270 could haul 1,220 tonnes at 60 km/h.

Production started in 1917 but by the end of the war, only 27 had been completed. Production in greater scale only started in 1920 and by 1922, 100 more had been built for the BBÖ. At the same time, 119 locomotives of the same design were built for the ČSD and designated class 434.1. Floridsdorf built a total of 253 for the ČSD, PKP, JDŽ, FS and the CFR. Together with more locomotives built by other manufacturers, the total had reached 574 by 1930.

The locomotives used in Austria became Reichsbahn 56 3401 to 3500 in 1938. After the war, the ÖBB only had 25 left and made them class 156. 15 were later rebuilt with Giesl ejectors and the last ones were used until 1968. The ČSD had received more from the BBÖ, leading to a total of 199. The last one of these was retired in 1976. Also the CFR operated a total of 132, the last ones until 1983. Five had also come to Albania. This wide spreading led to many being preserved in various states, with the ČSD 434.1100 and PKP Tr21-25 still being in working order.

General
Built1917-1930
ManufacturerBMMF, Breitfeld & Danek, ČKD, Adamov, Škoda, Wiener Neustadt, Floridsdorf
Wheel arr.2-8-0 (Consolidation) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length57 ft 2 3/4 in
Length loco36 ft 1 7/8 in
Wheelbase22 ft 3 11/16 in
Rigid wheelbase9 ft 2 1/4 in
Total wheelbase44 ft 11 13/16 in
Empty weight134,923 lbs
Service weight149,914 lbs
Adhesive weight126,325 lbs
Axle load31,747 lbs
Fuel capacitycoal
Boiler
Grate area41.7 sq ft
Firebox area149.6 sq ft
Tube heating area1,827.7 sq ft
Evaporative heating area1,977.3 sq ft
Superheater area412.3 sq ft
Total heating area2,389.6 sq ft
Power Plant
Driver diameter49.5 in
Boiler pressure188 psi
Expansion typesimple
Cylinderstwo, 22 7/16 x 24 7/8 in
Power
Power sourcesteam
Estimated power1,408 hp (1,050 kW)
Top speed37 mph
Starting effort40,537 lbf
Calculated Values
steam locomotive
freight
last changed: 07/2025
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