LNWR Webb Experiment Class
LNWR Experiment Class
|
| Type and origin |
| Power type |
Steam |
| Designer |
F. W. Webb |
| Builder |
Crewe Works |
| Serial number |
2500, 2625–2628, 2669–2673, 2734–2753 |
| Build date |
1882–84 |
| Total produced |
30 |
|
| Specifications |
Configuration:
|
|
| • Whyte
|
2-(2-2)-0 |
| • UIC
|
1AA n3v |
| Gauge |
4 ft 8 1⁄2 in (1,435 mm) |
| Leading dia. |
3 ft 6 in (1.067 m) |
|
Driver dia. |
6 ft 6 in (1.981 m) |
| Loco weight |
38 long tons (39 t) |
| Fuel type |
Coal |
| Heating surface |
1,083.5 sq ft (100.66 m2) |
| Cylinders |
Three: two high pressure outside, driving rear wheels; one low pressure inside, driving front drivers |
| High-pressure cylinder |
13 in × 24 in (330 mm × 610 mm) |
| Low-pressure cylinder |
26 in × 24 in (660 mm × 610 mm) |
| Valve gear |
Independent Joy valve gear for HP and LP |
|
|
|
| Type and origin |
| Power type |
Steam |
| Designer |
F. W. Webb |
| Builder |
Crewe Works |
| Serial number |
2500, 2625–2628, 2669–2673, 2734–2753 |
| Build date |
1882–84 |
| Total produced |
30 |
| Specifications |
Configuration:
|
|
| • Whyte
|
2-(2-2)-0 |
| • UIC
|
1AA n3v |
| Gauge |
4 ft 8 1⁄2 in (1,435 mm) |
| Leading dia. |
3 ft 6 in (1.067 m) |
|
Driver dia. |
6 ft 6 in (1.981 m) |
| Loco weight |
38 long tons (39 t) |
| Fuel type |
Coal |
| Heating surface |
1,083.5 sq ft (100.66 m2) |
| Cylinders |
Three: two high pressure outside, driving rear wheels; one low pressure inside, driving front drivers |
| High-pressure cylinder |
13 in × 24 in (330 mm × 610 mm) |
| Low-pressure cylinder |
26 in × 24 in (660 mm × 610 mm) |
| Valve gear |
Independent Joy valve gear for HP and LP |
The London and North Western Railway Experiment Class was a series of 30 three-cylinder 2-(2-2)-0 compound locomotives designed by Francis Webb for the London and North Western Railway between 1882 and 1884. They were Webb’s first large-scale experiment with a class of express compound locomotives, and the first engine was named accordingly. They were followed by a class of similar, but larger locomotives, that featured larger boilers and smaller driving wheels – the LNWR Dreadnought class.
After Webb's retirement, his successor, George Whale, withdrew the Experiment class locomotives soon after he took up office in 1903.
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