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 | |
|---|---|
| Class | 729 |
| Locobase ID | 2471 |
| Railroad | Austrian Federal Railways |
| Country | Austria |
| Whyte | 4-6-4T |
| Number in Class | 16 |
| Road Numbers | |
| Gauge | Std |
| Number Built | 16 |
| Builder | Floridsdorf |
| Year | 1931 |
| Valve Gear | Walschaert |
| 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 / 1300 |
| 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 Volume | 200.07 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 7201 |
| Same as above plus superheater percentage | 8569 |
| Same as above but substitute firebox area for grate area | 32,584 |
| Power L1 | 13,618 |
| Power MT | 810.59 |