Compare locomotives
Add a locomotive
South African classes GMA and GMAM
The Garratts of the classes GMA and GMAM are a development of the GM that was designed as a large and powerful locomotive for lines which only allowed a low axle load and had sharp curves. In comparison to their prede...
| South African classes GMA and GMAMRemove | |
|---|---|
| Variant | |
| Built | 1953-1958 |
| Manufacturers | Henschel;Beyer, Peacock & Co.;North British |
| Wheel arrangement | (2D1)(1D2) t ga |
| Gauge | 1067 mm |
| Length | 28600 mm |
| Service mass | 194501 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | South African classes GMA and GMAMRemove |
|---|---|
| Built | 1953-1958 |
| Manufacturers | Henschel, Beyer, Peacock & Co., North British |
| Wheel arrangement | 4-8-2+2-8-4T (Double Mountain (Garratt)) |
| Gauge | 1,067 mm |
Dimensions and weights
| Property | South African classes GMA and GMAMRemove |
|---|---|
| Length | 28.60 m |
| Wheelbase | 9.25 m |
| Total wheelbase | 26.31 m |
| Service mass | 194.5 t |
| Adhesion mass | 124.1 t |
| Rigid wheelbase | 4.39 m |
| Axle load | 16 t |
| Water capacity | 40,413 l |
| Fuel capacity | 14.2 t (coal) |
Boiler
| Property | South African classes GMA and GMAMRemove |
|---|---|
| Grate area | 5.87 m² |
| Firebox surface | 22.04 m² |
| Tube heating surface | 276.272 m² |
| Evaporative heating surface | 298.312 m² |
| Superheater surface | 69.399 m² |
| Total heating surface | 367.7 m² |
Power plant
| Property | South African classes GMA and GMAMRemove |
|---|---|
| Driver diameter | 1,372 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | four, 521 x 660 mm |
Power
| Property | South African classes GMA and GMAMRemove |
|---|---|
| Power source | steam |
| Estimated power | 1,622 kW (2,205 PS) |
| Starting effort | 306.0 kN |
Calculated values
| Property | South African classes GMA and GMAMRemove |
|---|---|
| Factor of adhesion | 1 : 3.98 |
| Optimal speed | 32 km/h |
| Power-to-weight ratio | 8.3 kW/t |
| Heating Surface Equivalent | 547.3 m² |
| Cylinder volume/HSE | 1 : 1,027.78 |
| Adhesive weight/Total | 1 : 1.57 |
| Tractive force/Heating surface | 1 : 17.38 |
| Grate area/Heating surface | 1 : 62.64 |
| Firebox/Tube surface | 1 : 12.54 |
| Total/Superheater | 1 : 4.30 |
