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South African class MJ
For heavy service on branch lines with a permitted axle load of less than 14 tons, D.A. Hendrie designed the 2-6-6-0 Mallet of the class MJ. It had a superheated boiler with a Belpaire firebox and Walschaerts valve ge...
| South African class MJRemove | |
|---|---|
| Variant | |
| Built | 1914, 1917, 1921 |
| Manufacturers | Maffei;North British |
| Wheel arrangement | (1C)C ma |
| Gauge | 1067 mm |
| Length | 20552 mm |
| Service mass | 85348 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | South African class MJRemove |
|---|---|
| Built | 1914, 1917, 1921 |
| Manufacturers | Maffei, North British |
| Wheel arrangement | 2-6-6-0 |
| Gauge | 1,067 mm |
Dimensions and weights
| Property | South African class MJRemove |
|---|---|
| Length | 20.55 m |
| Wheelbase | 9.96 m |
| Total wheelbase | 17.97 m |
| Service mass | 85.3 t |
| Adhesion mass | 77.4 t |
| Total mass | 140.3 t |
| Rigid wheelbase | 2.54 m |
| Axle load | 14 t |
| Water capacity | 19,321 l |
| Fuel capacity | 10.2 t (coal) |
Boiler
| Property | South African class MJRemove |
|---|---|
| Grate area | 3.716 m² |
| Firebox surface | 12.077 m² |
| Tube heating surface | 165.646 m² |
| Evaporative heating surface | 177.724 m² |
| Superheater surface | 31.866 m² |
| Total heating surface | 209.6 m² |
Power plant
| Property | South African class MJRemove |
|---|---|
| Driver diameter | 1,086 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | compound |
| Cylinders | four, HP: 419 x 610 mm and LP: 660 x 610 mm |
Power
| Property | South African class MJRemove |
|---|---|
| Power source | steam |
| Estimated power | 932 kW (1,267 PS) |
| Starting effort | 164.8 kN |
| Starting effort simple | 197.7 kN |
Calculated values
| Property | South African class MJRemove |
|---|---|
| Factor of adhesion | 1 : 4.61 |
| Optimal speed | 35 km/h |
| Power-to-weight ratio | 10.9 kW/t |
| Heating Surface Equivalent | 301.8 m² |
| Cylinder volume/HSE | 1 : 1,249.00 |
| Adhesive weight/Total | 1 : 1.10 |
| Tractive force/Heating surface | 1 : 16.42 |
| Grate area/Heating surface | 1 : 56.40 |
| Firebox/Tube surface | 1 : 13.72 |
| Total/Superheater | 1 : 5.58 |
