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London, Midland & Scottish Royal Scot class
The LMS inherited the many light locomotives from the Midland Railway, which were very often used double-headed. For example, heavy express trains on the West Coast Main Line were mostly seen behind either a pair of t...
General
| Property | London, Midland & Scottish Royal Scot class as built |
|---|---|
| Built | 1927, 1930 |
| Manufacturers | North British, Derby |
| Wheel arrangement | 4-6-0 (Ten-wheeler) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | London, Midland & Scottish Royal Scot class as built |
|---|---|
| Length | 19.22 m |
| Length loco | 12.52 m |
| Wheelbase | 8.38 m |
| Rigid wheelbase | 4.67 m |
| Empty weight | 78 t |
| Service weight | 86.3 t |
| Adhesive weight | 63.5 t |
| Axle load | 21.2 t |
| Total weight | 131.4 t |
| Water capacity | 15,910 l |
| Fuel capacity | 5.6 t (coal) |
Boiler
| Property | London, Midland & Scottish Royal Scot class as built |
|---|---|
| Grate area | 2.899 m² |
| Firebox surface | 17.559 m² |
| Tube heating surface | 175.68 m² |
| Evaporative heating surface | 193.239 m² |
| Superheater surface | 37.068 m² |
| Total heating surface | 230.3 m² |
Power plant
| Property | London, Midland & Scottish Royal Scot class as built |
|---|---|
| Driver diameter | 2,057 mm |
| Boiler pressure | 17.2 bar |
| Expansion type | simple expansion |
| Cylinders | three, 457 x 660 mm |
Power
| Property | London, Midland & Scottish Royal Scot class as built |
|---|---|
| Power source | steam |
| Estimated power | 1,715 kW (2,332 PS) |
| Starting effort | 147.5 kN |
Calculated values
| Property | London, Midland & Scottish Royal Scot class as built |
|---|---|
| Factor of adhesion | 1 : 4.23 |
| Optimal speed | 71 km/h |
| Power-to-weight ratio | 19.9 kW/t |
| Heating Surface Equivalent | 355.2 m² |
| Cylinder volume/HSE | 1 : 915.79 |
| Adhesive weight/Total | 1 : 1.36 |
| Tractive force/Heating surface | 1 : 13.37 |
| Grate area/Heating surface | 1 : 79.44 |
| Firebox/Tube surface | 1 : 10.01 |
| Total/Superheater | 1 : 5.21 |
