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Austrian Southern Railway class 35a
Italian State Railway class 452, Austrian Federal Railways (BBÖ) class 471 and Yugoslav Railway class 132
Austria-Hungary | 1871 | 55 produced
Die Lokomotive, July 1929

After the 0-8-0 wheel arrangement had established itself with the class 33 and 34 locomotives at the Semmering, the class 35a was created in 1871. Under the direction of Louis Adolf Gölsdorf, a new locomotive was created that, unlike its predecessors, had an inside frame and outside controls.

Since an axle load of 13 tonnes was now permitted, a significant increase in power was possible. With a length of 2,300 mm, the firebox achieved the best value for its time. Because it was completely behind the last axle and this could be moved sideways by 20 mm, there was a large overhanging mass. With a top speed of 35 km/h, however, this was of little consequence.

Sectional drawing with dimensions
Sectional drawing with dimensions
Die Lokomotive, July 1929

Production comprised 25 machines from Wiener Neustadt, 25 from the StEG workshops and five from Floridsdorf in 1871 and 1872. After the Upper Italian SFAI had loaned a locomotive for testing, 60 almost identical locomotives were ordered in Wiener Neustadt. These led to the later FS class 420, which was built by other manufacturers until 1905.

The locomotives of the class 35a were able to pull 210 tonnes on a ramp with a gradient of 2.5 percent. In addition to the Semmering Railway, they were also used on the Brenner Railway and in the Karst Plateau of present-day Slovenia. Like their predecessors, they were later given Kobel chimneys.

After the Second World War, 20 examples came to the FS and became class 452 there. 23 units came to the Kingdom of the Serbs, Croats and Slovenes, of which 16 were later taken over by the JDŽ as class 132. The twelve locomotives remaining in Austria became the class 471 of the BBÖ. The three locomotives remaining in 1938 were classified by the Reichsbahn as 55 5601 to 5603.

General
Built1871-1872
ManufacturerWiener Neustadt, StEG, Floridsdorf, Miani, Maffei
Axle config0-8-0 (Eight-coupled) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length loco31 ft 6 3/4 in
Wheelbase11 ft 8 3/16 in
Fixed wheelbase7 ft 9 11/16 in
Empty weight99,629 lbs
Service weight111,884 lbs
Adhesive weight111,884 lbs
Axle load28,660 lbs
Fuel capacitycoal
Power
Power sourcesteam
Estimated power603 hp (450 kW)
Optimal speed16 mph
Top speed22 mph
Starting effort23,707 lbf
Power Plant
Driver diameter43.5 in
Boiler pressure130 psi
Expansion typesimple
Cylinderstwo, 19 11/16 x 24 in
Boiler
Grate area23.3 sq ft
Firebox area115.2 sq ft
Tube heating area1,714.7 sq ft
Evaporative heating area1,829.9 sq ft
Total heating area1,829.9 sq ft
Calculated Values
steam locomotive
freight
Louis Adolf Gölsdorf
last changed: 01/2023
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