London, Brighton & South Coast Standard Craven 8 ft Express 2-4-0
Between 1862 and 1868, Craven had a total of 29 2-4-0 express locomotives built for the LB&SCR. As was usual at the time, they were only fundamentally similar, but had many differences in detail. Twelve were built in Brighton and the rest by Beyer, Peacock and by Dübs. One thing that almost all of them had in common was a driver diameter of six feet, only some had a smaller diameter of five and a half feet.
They all had inside cylinders and double frames. The load on the two driving axles was very different. On number 150 from 1862, the first driving axle carried 12 tons 7 cwt and the second only 6 tons 7 cwt. Number 28, delivered in 1868, was the LB&SCR's first coupled express locomotive with an enclosed cab. Their withdrawals took place between 1884 and 1891.
Technical data
General
| Property | 149, 150 | 12 |
|---|---|---|
| Built | 1862-1868 | |
| Manufacturers | Brighton, Beyer, Peacock & Co., Dübs & Co. | |
| Wheel arrangement | 2-4-0 (Porter) | |
| Gauge | 1,435 mm (Standard gauge) | |
Dimensions and weights
| Property | 149, 150 | 12 |
|---|---|---|
| Wheelbase | 4.19 m | 4.67 m |
| Service mass | 28.2 t | 33 t |
| Adhesion mass | 19 t | 22.4 t |
| Rigid wheelbase | 4.19 m | 4.67 m |
| Axle load | 12.5 t | 12.9 t |
| Length | 7.39 m |
Boiler
| Property | 149, 150 | 12 |
|---|---|---|
| Grate area | 1.39 m² | |
| Firebox surface | 8.361 m² | |
| Tube heating surface | 90.488 m² | |
| Evaporative heating surface | 98.849 m² | |
| Total heating surface | 98.8 m² |
Power plant
| Property | 149, 150 | 12 |
|---|---|---|
| Driver diameter | 1,829 mm | |
| Boiler pressure | 9.7 bar | |
| Expansion type | simple expansion | |
| Cylinders | two, 406 x 508 mm | |
Power
| Property | 149, 150 | 12 |
|---|---|---|
| Power source | steam | |
| Estimated power | 261 kW (355 PS) | 280 kW (381 PS) |
| Starting effort | 37.6 kN | |
Calculated values
| Property | 149, 150 | 12 |
|---|---|---|
| Factor of adhesion | 1 : 4.95 | 1 : 5.84 |
| Optimal speed | 42 km/h | 45 km/h |
| Power-to-weight ratio | 9.2 kW/t | 8.5 kW/t |
| Heating Surface Equivalent | 140.7 m² | |
| Cylinder volume/HSE | 1 : 937.00 | |
| Adhesive weight/Total | 1 : 1.49 | 1 : 1.47 |
| Tractive force/Heating surface | 1 : 7.95 | |
| Grate area/Heating surface | 1 : 71.11 | |
| Firebox/Tube surface | 1 : 10.82 |
