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Austrian Federal Railways (BBÖ) class 81
Austrian Federal Railways class 58 and Yugoslav State Railway class 20
Austria-Hungary | 1920 | 83 produced
58.744 in the Strasshof Railway Museum
58.744 in the Strasshof Railway Museum
Loco Steve

In order to be able to operate coal trains weighing up to 1,600 tonnes from the Moravian-Silesian coal fields, a more powerful freight locomotive was needed. Although Gölsdorf had already developed a ten-coupled freight locomotive with the classes 80 and 180 before the First World War, they could not be used in front of express freight trains due to the lack of a leading axle. The designs came in 1916 from Gölsdorf's successor Rihosek and initially envisaged a compound engine

The locomotives that were only delivered after the end of the war from 1920 onwards were ultimately given a simple engine, since the additional expense of a compound engine was now considered unnecessary for freight locomotives. Not only the boiler was largely taken over from the classes 380 and 470, but also many other assemblies such as the chassis. The Adams axle could be moved laterally by 65 mm and the first and fifth coupled axles could each be moved by 26 mm. In contrast to the 80 and 180, the third coupled axle, which was the driving axle here, could not be moved and therefore had no wheel flanges

The prototype 81.01 delivered in 1920 could be recognized by the Kobel chimney. During test runs on a gradient of around one percent, 598 tonnes were pulled at 38.5 km/h. On the Tauern railway with 2.78 percent, 303 tonnes could still be transported at 28 km/h, with power reserves apparently still being available in the boiler. The production machines that were then delivered had a normal chimney, a larger steam dome and different types of feedwater preheaters.

The locomotives, which were only put into service after the collapse of the monarchy, could no longer be used on the intended routes and were therefore run in other regions. There they were used not only in front of express freight trains, but also in front of express passenger trains. By 1923, 40 locomotives were built for the BBÖ in Floridsdorf, 16 in the StEG factory, 14 in Wiener Neustadt and three at Krauss in Linz. The last 18 pieces were designated as class 81.4 and had received a Lentz valve gear, a Dabeg mixing preheater and partly a small tube superheater with 92.4 square meters.

Ten more locomotives were purchased by the SHS Kingdom railways in Wiener Neustadt and later listed as class 29 by the JDŽ. The machines of the BBÖ were classified by the Reichsbahn as class 587 from 1938 and kept their running numbers with the ÖBB after the Second World War. 17 of them came to JDŽ. The Austrian locomotives were retired by 1961. Today there are still one Austrian and one Yugoslavian locomotive.

General
Built1920-1923
ManufacturerWiener Neustadt, Floridsdorf, StEG, Krauss Linz
Axle config2-10-0 (Decapod) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length59 ft 3 7/8 in
Wheelbase27 ft 10 5/8 in
Fixed wheelbase14 ft 9 3/16 in
Total wheelbase48 ft 9 13/16 in
Empty weight158,733 lbs
Service weight178,574 lbs
Adhesive weight156,528 lbs
Total weight266,759 lbs
Axle load31,306 lbs
Water capacity4,227 us gal
Fuel capacity16,535 lbs (coal)
Power
Power sourcesteam
Indicated power1,515 hp (1,130 kW)
Optimal speed20 mph
Top speed34 mph
Starting effort48,590 lbf
Power Plant
Driver diameter51.1 in
Boiler pressure218 psi
Expansion typesimple
Cylinderstwo, 23 1/4 x 24 7/8 in
Boiler
Grate area48 sq ft
Firebox area166.8 sq ft
Tube heating area2,079.6 sq ft
Evaporative heating area2,246.4 sq ft
Superheater area540.3 sq ft
Total heating area2,786.8 sq ft
Calculated Values
steam locomotive
freight
Johann Rihosek
last changed: 02/2023
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