LNWR Class A
No. 50 in photographic grey livery
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| Type and origin | |
|---|---|
| Power type | Steam |
| Designer | F.W. Webb |
| Builder | LNWR at Crewe Works |
| Build date | 1893–1900 |
| Total produced | 111 |
| Specifications | |
|---|---|
| Configuration: |
|
| • Whyte | 0-8-0 |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Driver dia. | 4 ft 8 in (1.42 m) |
| Wheelbase | 17 ft 3 in (5.26 m) |
| Loco weight | 50 long tons 0 cwt (112,000 lb or 50.8 t) |
| Fuel type | Coal |
| Boiler pressure | 175 psi (1.21 MPa) |
| Heating surface | 1,489 sq ft (138.3 m2) |
| Cylinders | Three, compound |
| High-pressure cylinder | (2 outside) 15 by 24 inches (380 mm × 610 mm) |
| Low-pressure cylinder | (1 inside) 30 by 24 inches (760 mm × 610 mm) |
| Valve gear | Stephenson link motion |
| Career | |
|---|---|
| Operators | London and North Western Railway |
| Disposition | 15 rebuilt to Class C 1904–06 62 rebuilt to Class D 1906–09 34 rebuilt to Class C1 1909–12 |
The London and North Western Railway (LNWR) Class A was a class of 0-8-0 steam locomotives. From 1893 to 1900, Crewe Works built 111 of these engines, which had a three-cylinder compound arrangement, and were designed by Francis Webb. According to the LNWR Society, 110 were built between 1894 and 1900.
Like the other Webb compounds, they proved problematic, so in 1904 George Whale began rebuilding these to simple expansion engines. Fifteen were converted to Class C between 1904–1906, 62 to Class D between 1906–1909, with the remaining 34 rebuilt by Charles Bowen Cooke to Class C1 between 1909-1912.
The LNWR letter classification system for 8 coupled engines (A, B, C, etc.) was introduced in 1911.
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