South Australian class H
The class H was a 4-4-0 goods locomotive designed for work on the line between Roseworthy and Burra-Burra that was limited to light axle loads. It used the same boiler as the 2-4-0 of the class C, but had less load on the individual axles due to the bogie at the front. The first three were built by Robert Stephenson & Co. in 1870, but their good performances led to three more orders which brought the total to nine. From 1886, they were replaced by the 4-6-0 class R on their original line and were transferred to another line. One was withdrawn in 1888, but the SAR has already begun to rebuild all others in 1880. The rebuilding process was completed in 1910 and seven members of the class survived until the twenties. More withdrawals followed and the last one was gone by 1930.
Technical data
General
- Built
- 1870-1877
- Manufacturers
- Robert Stephenson & Co.
- Wheel arrangement
- 4-4-0 (American)
- Gauge
- 1,600 mm (Irish broad gauge)
Dimensions and weights
- Length
- 13.56 m
- Wheelbase
- 5.49 m
- Service mass
- 26.6 t
- Adhesion mass
- 17.9 t
- Total mass
- 44.7 t
- Rigid wheelbase
- 2.29 m
- Axle load
- 8.9 t
- Water capacity
- 4,819 l
- Fuel capacity
- 3.8 t (coal)
Boiler
- Grate area
- 1.18 m²
- Firebox surface
- 6.791 m²
- Tube heating surface
- 72.52 m²
- Evaporative heating surface
- 79.311 m²
- Total heating surface
- 79.3 m²
Power plant
- Driver diameter
- 1,372 mm
- Boiler pressure
- 9 bar
- Expansion type
- simple expansion
- Cylinders
- two, 356 x 508 mm
Power
- Power source
- steam
- Estimated power
- 168 kW (228 PS)
- Starting effort
- 35.7 kN
Calculated values
- Factor of adhesion
- 1 : 4.92
- Optimal speed
- 29 km/h
- Power-to-weight ratio
- 6.3 kW/t
- Heating Surface Equivalent
- 113.3 m²
- Cylinder volume/HSE
- 1 : 890.86
- Adhesive weight/Total
- 1 : 1.49
- Tractive force/Heating surface
- 1 : 9.40
- Grate area/Heating surface
- 1 : 67.21
- Firebox/Tube surface
- 1 : 10.68