The reference for locomotives and railcars


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Imperial-Royal State Railways class 6
Czechoslovak State Railways class 264.0 and Polish State Railways Pd12
Austria-Hungary | 1894 | 68 produced
Die Lokomotive, September 1908

As a successor to the class 4 and 5 express locomotives, Karl Gölsdorf developed the class 6, which was his first express locomotive. Like its predecessors, it also had two coupled and running axles each. In order to achieve the required increase in output, Gölsdorf took a different approach to arranging the boiler, which was inspired by the famous number 999 of the Pennsylvania Railroad, among others.

Instead of arranging the boiler very low, as was previously the case, to achieve the smoothest possible running, a boiler with a larger diameter was used here, with the firebox standing completely above the frame. Thus, a continuous output of up to 900 hp could be achieved through a larger grate and evaporation surface. In addition, a two-cylinder compound engine with the high-pressure cylinder on the right side was used.

A total of 68 examples were built between 1894 and 1898, which reached speeds of up to 130 km/h in test drives. Nevertheless, the certification was only granted for a speed of 90 km/h, which was sufficient in Austria. The BBÖ still had 20 units in service after the First World War and used them until 1932. 28 units were in service with the CSD until 1938 as series 264.0 and nine more with the PKP as Pd12.

ManufacturerFloridsdorf, Wiener Neustadt, StEG
Axle config4-4-0 (American) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length loco32 ft 10 in
Wheelbase23 ft 11 3/8 in
Fixed wheelbase9 ft 2 1/4 in
Empty weight113,538 lbs
Service weight125,663 lbs
Adhesive weight63,934 lbs
Axle load31,967 lbs
Water capacity4,412 us gal
Fuel capacity12,125 lbs (coal)
Power sourcesteam
Indicated power888 hp (662 kW)
Optimal speed42 mph
Top speed56 mph
Starting effort13,545 lbf
with start valve16,254 lbf
Power Plant
Driver diameter84.3 in
Boiler pressure188 psi
Expansion typecompound
Cylinderstwo, HP: 19 11/16 x 26 3/4 in
and LP: 29 1/8 x 26 3/4 in
Grate area31.2 sq ft
Firebox area118.4 sq ft
Tube heating area1,555.4 sq ft
Evaporative heating area1,673.8 sq ft
Total heating area1,673.8 sq ft
Calculated Values
steam locomotive
Karl Gölsdorf
last changed: 06/2022

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