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Rhodesia Railways classes 20 and 20A
The most powerful locomotives to ever operate for the Rhodesia Railways were the Garratts of the 20[h]th[/h] class. They were of the wheel arrangement 4-8-2+2-8-4T (Double Mountain) and weighed more than 220 tons. Fea...
| Rhodesia Railways classes 20 and 20ARemove | |
|---|---|
| Variant | Standard |
| Built | 1954-1958 |
| Manufacturers | Beyer, Peacock & Co. |
| Wheel arrangement | (2D1)(1D2) t ga |
| Gauge | 1435 mm |
| Length | 31445 mm |
| Service mass | 226985 kg |
| Top speed | 69 km/h |
| Power | |
| Engine |
General
| Property | Rhodesia Railways classes 20 and 20A Standard Remove |
|---|---|
| Built | 1954-1958 |
| Manufacturers | Beyer, Peacock & Co. |
| Wheel arrangement | 4-8-2+2-8-4T (Double Mountain (Garratt)) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Rhodesia Railways classes 20 and 20A Standard Remove |
|---|---|
| Length | 31.45 m |
| Service mass | 227 t |
| Adhesion mass | 138.5 t |
| Axle load | 17.3 t |
| Water capacity | 36,370 l |
| Fuel capacity | 14 t (coal) |
Boiler
| Property | Rhodesia Railways classes 20 and 20A Standard Remove |
|---|---|
| Grate area | 5.862 m² |
| Firebox surface | 21.646 m² |
| Tube heating surface | 259.293 m² |
| Evaporative heating surface | 280.939 m² |
| Superheater surface | 69.492 m² |
| Total heating surface | 350.4 m² |
Power plant
| Property | Rhodesia Railways classes 20 and 20A Standard Remove |
|---|---|
| Driver diameter | 1,295 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | four, 508 x 660 mm |
Power
| Property | Rhodesia Railways classes 20 and 20A Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 1,585 kW (2,155 PS) |
| Top speed | 69 km/h |
| Starting effort | 308.4 kN |
Calculated values
| Property | Rhodesia Railways classes 20 and 20A Standard Remove |
|---|---|
| Factor of adhesion | 1 : 4.41 |
| Optimal speed | 32 km/h |
| Power-to-weight ratio | 7.0 kW/t |
| Heating Surface Equivalent | 528.2 m² |
| Cylinder volume/HSE | 1 : 1,013.74 |
| Adhesive weight/Total | 1 : 1.64 |
| Tractive force/Heating surface | 1 : 18.38 |
| Grate area/Heating surface | 1 : 59.78 |
| Firebox/Tube surface | 1 : 11.98 |
| Total/Superheater | 1 : 4.04 |
