The reference for locomotives and railcars


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Imperial-Royal State Railways and Austrian Southern Railway class 9
Austrian Federal Railways (BBÖ) class 409
Austria-Hungary | 1898 | 42 produced
Locomotive Magazine, August 1903

In order to obtain a powerful express locomotive for mountainous routes, Gölsdorf had a 4-6-0 locomotive with 1,820 mm wheels built from 1898 onwards. An outer frame with internal cylinders was unusual for heavy steam locomotives from the European mainland around the turn of the century. The positioning of the cylinders was probably necessary to comply with the loading gauge, since it was a two-cylinder compound engine with the largest low-pressure cylinder that had been installed up to that moment. The valve gear remained outside of the frame. A more than four meter long steam collection tank on the upper edge of the boiler was there to keep sufficient quantities of steam in stock for longer gradients.

The state railways received a total of 38 engines by 1903 and the southern railway four more. Despite their considerable size, the locomotives only achieved a calculated output of around 1,000 hp, which did not live up to expectations. Depending on the source, this was either related to the low quality of the coal used, to the high internal drag of the engine, or to the insufficient knowledge of the crews. After the BBÖ had taken over all examples from the kkStB and Südbahn, 19 units were converted to the class 409. The remaining 23 units that were not converted were retired by 1938.

ManufacturerStEG, Floridsdorf, BMMF
Axle config4-6-0 (Ten-wheeler) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length58 ft 7 9/16 in
Length loco37 ft 6 11/16 in
Wheelbase27 ft 8 11/16 in
Fixed wheelbase12 ft 9 9/16 in
Empty weight139,332 lbs
Service weight153,882 lbs
Adhesive weight97,114 lbs
Axle load31,636 lbs
Water capacity4,438 us gal
Fuel capacity14,991 lbs (coal)
Power sourcesteam
Estimated power905 hp (675 kW)
Optimal speed28 mph
Top speed56 mph
Starting effort20,821 lbf
with start valve24,985 lbf
Power Plant
Driver diameter71.7 in
Boiler pressure203 psi
Expansion typecompound
Cylinderstwo, HP: 20 7/8 x 28 3/8 in
and LP: 31 7/8 x 28 3/8 in
Grate area33.4 sq ft
Firebox area166.8 sq ft
Tube heating area1,851.4 sq ft
Evaporative heating area2,018.2 sq ft
Total heating area2,018.2 sq ft
Calculated Values
steam locomotive
Karl Gölsdorf
last changed: 07/2022

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