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North British class M 4-4-0
Dugald Drummond undertook the first trials with a powerful 4-4-0 express locomotive of the North British Railway in the 1870s. These twelve examples were from Neilson & Co. and from North British's own workshops and w...
| North British class M 4-4-0Remove | |
|---|---|
| Variant | |
| Built | 1884, 1890-1895, 1898-1899 |
| Manufacturers | Cowlairs |
| Wheel arrangement | 2B |
| Gauge | 1435 mm |
| Length | 13208 mm |
| Service mass | 46637 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | North British class M 4-4-0Remove |
|---|---|
| Built | 1884, 1890-1895, 1898-1899 |
| Manufacturers | Cowlairs |
| Wheel arrangement | 4-4-0 (American) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | North British class M 4-4-0Remove |
|---|---|
| Length | 13.21 m |
| Length loco | 6.73 m |
| Wheelbase | 6.73 m |
| Service mass | 46.6 t |
| Adhesion mass | 31.2 t |
| Total mass | 79.2 t |
| Rigid wheelbase | 2.74 m |
| Axle load | 15.9 t |
| Water capacity | 13,639 l |
| Fuel capacity | 5.6 t (coal) |
Boiler
| Property | North British class M 4-4-0Remove |
|---|---|
| Grate area | 1.858 m² |
| Firebox surface | 10.963 m² |
| Tube heating surface | 106.653 m² |
| Evaporative heating surface | 117.615 m² |
| Total heating surface | 117.6 m² |
Power plant
| Property | North British class M 4-4-0Remove |
|---|---|
| Driver diameter | 1,981 mm |
| Boiler pressure | 10.3 bar |
| Expansion type | simple expansion |
| Cylinders | two, 457 x 660 mm |
Power
| Property | North British class M 4-4-0Remove |
|---|---|
| Power source | steam |
| Estimated power | 410 kW (557 PS) |
| Starting effort | 61.3 kN |
Calculated values
| Property | North British class M 4-4-0Remove |
|---|---|
| Factor of adhesion | 1 : 5.00 |
| Optimal speed | 40 km/h |
| Power-to-weight ratio | 8.8 kW/t |
| Heating Surface Equivalent | 172.4 m² |
| Cylinder volume/HSE | 1 : 1,257.55 |
| Adhesive weight/Total | 1 : 1.49 |
| Tractive force/Heating surface | 1 : 10.88 |
| Grate area/Heating surface | 1 : 63.30 |
| Firebox/Tube surface | 1 : 9.73 |
