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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 | 1877-1879 |
| Manufacturers | Neilson & Co.;Cowlairs |
| Wheel arrangement | 2B |
| Gauge | 1435 mm |
| Length | 13030 mm |
| Service mass | 47348 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | North British class M 4-4-0Remove |
|---|---|
| Built | 1877-1879 |
| Manufacturers | Neilson & Co., Cowlairs |
| Wheel arrangement | 4-4-0 (American) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | North British class M 4-4-0Remove |
|---|---|
| Length | 13.03 m |
| Length loco | 6.73 m |
| Wheelbase | 6.73 m |
| Service mass | 47.3 t |
| Adhesion mass | 30 t |
| Total mass | 79.9 t |
| Rigid wheelbase | 2.74 m |
| Axle load | 15 t |
| Water capacity | 13,639 l |
| Fuel capacity | 5.6 t (coal) |
Boiler
| Property | North British class M 4-4-0Remove |
|---|---|
| Grate area | 1.951 m² |
| Firebox surface | 9.538 m² |
| Tube heating surface | 90.89 m² |
| Evaporative heating surface | 100.428 m² |
| Total heating surface | 100.4 m² |
Power plant
| Property | North British class M 4-4-0Remove |
|---|---|
| Driver diameter | 1,981 mm |
| Boiler pressure | 9.7 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 | 373 kW (507 PS) |
| Starting effort | 57.2 kN |
Calculated values
| Property | North British class M 4-4-0Remove |
|---|---|
| Factor of adhesion | 1 : 5.14 |
| Optimal speed | 40 km/h |
| Power-to-weight ratio | 7.9 kW/t |
| Heating Surface Equivalent | 148.1 m² |
| Cylinder volume/HSE | 1 : 1,463.97 |
| Adhesive weight/Total | 1 : 1.58 |
| Tractive force/Heating surface | 1 : 11.89 |
| Grate area/Heating surface | 1 : 51.48 |
| Firebox/Tube surface | 1 : 9.53 |
