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South African class GG
The sole member of the SAR class GG was a Double Prairie Garratt built for fast passenger service in the Touws River area. For this task it had the largest drivers yet seen on a Garratt in South Africa with 57 inches ...
General
| Property | South African class GGRemove |
|---|---|
| Built | 1925 |
| Manufacturers | Beyer, Peacock & Co. |
| Wheel arrangement | 2-6-2+2-6-2T (Double Prairie (Garratt)) |
| Gauge | 1,067 mm (Cape gauge) |
Dimensions and weights
| Property | South African class GGRemove |
|---|---|
| Wheelbase | 20.52 m |
| Rigid wheelbase | 3.05 m |
| Service weight | 150.1 t |
| Adhesive weight | 96 t |
| Axle load | 16.5 t |
| Water capacity | 20,911 l |
| Fuel capacity | 10.2 t (coal) |
Boiler
| Property | South African class GGRemove |
|---|---|
| Grate area | 4.831 m² |
| Firebox surface | 19.51 m² |
| Tube heating surface | 219.809 m² |
| Evaporative heating surface | 239.318 m² |
| Superheater surface | 36.232 m² |
| Total heating surface | 275.6 m² |
Power plant
| Property | South African class GGRemove |
|---|---|
| Driver diameter | 1,448 mm |
| Boiler pressure | 12.4 bar |
| Expansion type | simple expansion |
| Cylinders | four, 457 x 660 mm |
Power
| Property | South African class GGRemove |
|---|---|
| Power source | steam |
| Estimated power | 1,268 kW (1,724 PS) |
| Top speed | 92 km/h |
| Starting effort | 201.2 kN |
Calculated values
| Property | South African class GGRemove |
|---|---|
| Factor of adhesion | 1 : 4.68 |
| Optimal speed | 39 km/h |
| Power-to-weight ratio | 8.4 kW/t |
| Heating Surface Equivalent | 409.3 m² |
| Cylinder volume/HSE | 1 : 1,059.48 |
| Adhesive weight/Total | 1 : 1.56 |
| Tractive force/Heating surface | 1 : 15.25 |
| Grate area/Heating surface | 1 : 57.04 |
| Firebox/Tube surface | 1 : 11.27 |
| Total/Superheater | 1 : 6.61 |
