Austrian Federal Railways 4-6-4 Locomotives in Austria

Class Details by Steve Llanso of Sweat House Media

Class 729 (Locobase 2471)

Data from H. le Fleming (in Ransome-Wallis, 1959).

Tank locomotive of compact design, but surprisingly good riding qualities. Le Flemming attributed this smoothness to positioning of the bogie pivot centers inside of the center line (i.e., toward the drivers from each end). In the front the offset was 4 3/4", in the rear 2". The first 10, delivered in 1931-1932, had a firebox heating surface of 12 sq m. (129.17 sq ft). The last six had the larger firebox area shown in the specs - this represented the addition of Nicholson thermic syphons.

A listing of all locomotives taken into the Deutsche Reichsbahn shown on [] (first viewed 26 February 2004) shows that the DRG took all 16 built as BR 79 601-616.

Principal Dimensions by Steve Llanso of Middle Run Media

Locobase ID2471
RailroadAustrian Federal Railways
Number in Class16
Road Numbers
Number Built16
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)11.81 / 3.60
Engine Wheelbase (ft / m)41.45 / 12.63
Ratio of driving wheelbase to overall engine wheelbase 0.28
Overall Wheelbase (engine & tender) (ft / m)41.45 / 12.63
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)111,113 / 50,400
Engine Weight (lbs / kg)249,343 / 113,100
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)249,343 / 113,100
Tender Water Capacity (gals / ML)4435 / 16.80
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 6.60 / 6
Minimum weight of rail (calculated) (lb/yd / kg/m)62 / 31
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)63.50 / 1614
Boiler Pressure (psi / kPa)188.50 / 13
High Pressure Cylinders (dia x stroke) (in / mm)19.69" x 28.35" / 500x720
Tractive Effort (lbs / kg)27,733 / 12579.49
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.01
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)145.26 / 13.50
Grate Area (sq ft / m2)38.20 / 3.55
Evaporative Heating Surface (sq ft / m2)1999 / 185.80
Superheating Surface (sq ft / m2)455 / 42.30
Combined Heating Surface (sq ft / m2)2454 / 228.10
Evaporative Heating Surface/Cylinder Volume200.07
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation7201
Same as above plus superheater percentage8569
Same as above but substitute firebox area for grate area32,584
Power L113,618
Power MT810.59

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