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South African class 23
The class 23, designed by W.A.J. Day and introduced in 1938, was the last 4-8-2 locomotive built for the SAR. It was similar to the class 15F and used the same Watson Standard No. 3B boiler. Both were also the heavies...
| South African class 23Remove | |
|---|---|
| Variant | Standard |
| Built | 1938-1939 |
| Manufacturers | BMAG |
| Wheel arrangement | 2D1 |
| Gauge | 1067 mm |
| Length | 26549 mm |
| Service mass | 112883 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | South African class 23 Standard Remove |
|---|---|
| Built | 1938-1939 |
| Manufacturers | BMAG |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,067 mm |
Dimensions and weights
| Property | South African class 23 Standard Remove |
|---|---|
| Length | 26.55 m |
| Wheelbase | 11.29 m |
| Total wheelbase | 23.69 m |
| Service mass | 112.9 t |
| Adhesion mass | 73.7 t |
| Total mass | 222.3 t |
| Rigid wheelbase | 5.03 m |
| Axle load | 19 t |
| Water capacity | 41,825 l |
| Fuel capacity | 18.3 t (coal) |
Boiler
| Property | South African class 23 Standard Remove |
|---|---|
| Grate area | 5.853 m² |
| Firebox surface | 21.554 m² |
| Tube heating surface | 294.317 m² |
| Evaporative heating surface | 315.871 m² |
| Superheater surface | 62.803 m² |
| Total heating surface | 378.7 m² |
Power plant
| Property | South African class 23 Standard Remove |
|---|---|
| Driver diameter | 1,600 mm |
| Boiler pressure | 15.5 bar |
| Expansion type | simple expansion |
| Cylinders | two, 610 x 711 mm |
Power
| Property | South African class 23 Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 1,939 kW (2,636 PS) |
| Starting effort | 217.8 kN |
Calculated values
| Property | South African class 23 Standard Remove |
|---|---|
| Factor of adhesion | 1 : 3.32 |
| Optimal speed | 55 km/h |
| Power-to-weight ratio | 17.2 kW/t |
| Heating Surface Equivalent | 549.2 m² |
| Cylinder volume/HSE | 1 : 755.85 |
| Adhesive weight/Total | 1 : 1.53 |
| Tractive force/Heating surface | 1 : 12.01 |
| Grate area/Heating surface | 1 : 64.70 |
| Firebox/Tube surface | 1 : 13.65 |
| Total/Superheater | 1 : 5.03 |
