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Natal Government Railways class B (1909) “Hendrie D”
The class B of 1909, also called “Hendrie D” after its designer, was the first 4-8-2 “Mountain” locomotive with a firebox behind all driving axles . It was intended for heavy coal traffic on the upper Natal mainline a...
| Natal Government Railways class B (1909) “Hendrie D”Remove | |
|---|---|
| Variant | as built |
| Built | 1909-1910 |
| Manufacturers | North British |
| Wheel arrangement | 2D1 |
| Gauge | 1067 mm |
| Length | 19266 mm |
| Service mass | 81385 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Natal Government Railways class B (1909) “Hendrie D”as built |
|---|---|
| Built | 1909-1910 |
| Manufacturers | North British |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,067 mm |
Dimensions and weights
| Property | Natal Government Railways class B (1909) “Hendrie D”as built |
|---|---|
| Length | 19.27 m |
| Wheelbase | 9.37 m |
| Total wheelbase | 16.96 m |
| Service mass | 81.4 t |
| Adhesion mass | 59.9 t |
| Total mass | 126 t |
| Rigid wheelbase | 3.89 m |
| Axle load | 15.3 t |
| Water capacity | 18,185 l |
| Fuel capacity | 8.4 t (coal) |
Boiler
| Property | Natal Government Railways class B (1909) “Hendrie D”as built |
|---|---|
| Grate area | 3.159 m² |
| Firebox surface | 12.914 m² |
| Tube heating surface | 239.876 m² |
| Evaporative heating surface | 252.789 m² |
| Total heating surface | 252.8 m² |
Power plant
| Property | Natal Government Railways class B (1909) “Hendrie D”as built |
|---|---|
| Driver diameter | 1,156 mm |
| Boiler pressure | 12.4 bar |
| Expansion type | simple expansion |
| Cylinders | two, 533 x 610 mm |
Power
| Property | Natal Government Railways class B (1909) “Hendrie D”as built |
|---|---|
| Power source | steam |
| Estimated power | 783 kW (1,065 PS) |
| Starting effort | 158.3 kN |
Calculated values
| Property | Natal Government Railways class B (1909) “Hendrie D”as built |
|---|---|
| Factor of adhesion | 1 : 3.71 |
| Optimal speed | 31 km/h |
| Power-to-weight ratio | 9.6 kW/t |
| Heating Surface Equivalent | 317.4 m² |
| Cylinder volume/HSE | 1 : 858.46 |
| Adhesive weight/Total | 1 : 1.36 |
| Tractive force/Heating surface | 1 : 13.08 |
| Grate area/Heating surface | 1 : 80.02 |
| Firebox/Tube surface | 1 : 18.57 |
