Data from [], accessed 4 August 2006.
The wikipedia entry says this began as a 15-engine class for the Sudbahn to replace the 229 in light express passenger service. A demand for more power and the consequent increase in weight led to the adoption of the 4-6-2T arrangement. Such was the timing of world events and the development of locomotive types that this is the only such design of that wheel arrangement that Austrian railways would ever adopt.
Finding that the 629s ran smoothly, quietly, and could easily hit 85 km/h (57 mph), the kKStB ordered more. Ultimately, when the kkStB had been superseded by the BB+, the class was numbered as follows (in order of construction):
Earlier class Years built
77.66-80 629,01-15 1913-1915
77.01-10 629.01-25 1917-1918
77.11-40 629.26-55 1920-1922
77.242-264 629.57-80 1926-1927
77.281-285 formerly from BB+ row 629,500-504 (year of construction 1927/28)
Principal Dimensions by Steve Llanso of Middle Run Media | |
---|---|
Class | 629 / 77 |
Locobase ID | 4709 |
Railroad | kaiserlich-Koeniglichen Oesterreichischen StB (kKStB) |
Country | Austria |
Whyte | 4-6-2T |
Number in Class | 85 |
Road Numbers | 629.01 - 629.80 |
Gauge | Std |
Number Built | 85 |
Builder | several |
Year | 1913 |
Valve Gear | Heusinger |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 11.81 / 3.60 |
Engine Wheelbase (ft / m) | 31.46 / 9.59 |
Ratio of driving wheelbase to overall engine wheelbase | 0.38 |
Overall Wheelbase (engine & tender) (ft / m) | 31.46 / 9.59 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
Weight on Drivers (lbs / kg) | 99,208 / 45,000 |
Engine Weight (lbs / kg) | 184,747 / 83,800 |
Tender Loaded Weight (lbs / kg) | |
Total Engine and Tender Weight (lbs / kg) | |
Tender Water Capacity (gals / ML) | 3168 / 12 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3.50 / 3 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 55 / 27.50 |
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) | 18.7" x 28.35" / 475x720 |
Tractive Effort (lbs / kg) | 25,015 / 11346.63 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.97 |
Heating Ability | |
Tubes (number - dia) (in / mm) | |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | |
Firebox Area (sq ft / m2) | 131.27 / 12.20 |
Grate Area (sq ft / m2) | 29.05 / 2.70 |
Evaporative Heating Surface (sq ft / m2) | 1526 / 141.85 |
Superheating Surface (sq ft / m2) | 363 / 33.75 |
Combined Heating Surface (sq ft / m2) | 1889 / 175.60 |
Evaporative Heating Surface/Cylinder Volume | 169.33 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 5476 |
Same as above plus superheater percentage | 6516 |
Same as above but substitute firebox area for grate area | 29,446 |
Power L1 | 12,063 |
Power MT | 804.20 |