Öesterreichische Bundesbahnen 2-10-0 Locomotives in Austria

Class Details by Steve Llanso of Sweat House Media

Class 81 / 58.70 (Locobase 4668)

Data from [], accessed 24 June 2007. Tube and flue heating surface was measured on the fire side; water-side areas (as calculated in US and British locomotives, e.g.) calculated to be approximately 10% more.

Series 81 on the BB+, later reclassed as Series 58 on the Austrian State. These decapods were a response to the increasingly heavy coal trains serving the Mahrisch-Schlesichen coal region. Originally conceived of as a compound engine, the 81 was delayed by World War I and only appeared in 1920. By that time, the design had been recast with simple-expansion cylinders and the original service for which it had been intended no longer fell under Austrian rule. They were small engines, even when compared to other contemporary 2-10-0s in service outside of North America.

Even so, the BBO built several dozen. Floridsdorf contributed the greatest number (40) with StEG adding 16, Wiener-Neustadt 14, and Krauss Linz 3.

Although they were rated at 55 km/h (35 mph) because of their small drivers, the BBO did use some in express freight service. 10 of the Wiener-Neustadt engines went to Yugoslavia State Railways in 1927 as their class 29.

18 of the 73 (those numbered in the 400 seriese) had Lentz poppet valve gear and Dabeg feedwater heater; four of these had a novel superheater that consisted of 132 small tubes (rather than the usual, substantially larger flues) and measured 92.4 sq m in heating surface.

Of the 73 that went into German service after the 1938 Anschluss, 53 remained for use by the postwar +BB. The last of these was retired in 1961.

Principal Dimensions by Steve Llanso of Sweat House Media

Class81 / 58.70
Locobase ID4668
RailroadÖesterreichische Bundesbahnen
Number in Class73
Road Numbers81.01-055, 400-415, 450-451
Number Built73
Valve GearHeusinger
Locomotive Length and Weight
Driver Wheelbase (ft / m)14.76 / 4.50
Engine Wheelbase (ft / m)27.89 / 8.50
Ratio of driving wheelbase to overall engine wheelbase 0.53
Overall Wheelbase (engine & tender) (ft / m)48.82 / 14.88
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)156,528 / 71,000
Engine Weight (lbs / kg)178,574 / 81,000
Tender Loaded Weight (lbs / kg)85,980 / 39,000
Total Engine and Tender Weight (lbs / kg)264,554 / 120,000
Tender Water Capacity (gals / ML)4224 / 16
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 7.50 / 7
Minimum weight of rail (calculated) (lb/yd / kg/m)52 / 26
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)51.10 / 1298
Boiler Pressure (psi / kPa)217.60 / 15
High Pressure Cylinders (dia x stroke) (in / mm)23.23" x 24.8" / 590x630
Tractive Effort (lbs / kg)48,440 / 21972.04
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.23
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)15.42 / 4.70
Firebox Area (sq ft / m2)166.78 / 15.50
Grate Area (sq ft / m2)44.55 / 4.14
Evaporative Heating Surface (sq ft / m2)2043 / 189.90
Superheating Surface (sq ft / m2)540 / 50.20
Combined Heating Surface (sq ft / m2)2583 / 240.10
Evaporative Heating Surface/Cylinder Volume167.94
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation9694
Same as above plus superheater percentage11,730
Same as above but substitute firebox area for grate area43,913
Power L111,786
Power MT830.00

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