LNWR Class A

LNWR Class A
File:LNWR locomotive No.50, A Class.jpg No. 50 in photographic grey livery
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  • UIC D n3vG Gauge 4 ft 8+1⁄2 in (1,435 mm) Driver dia. 4 ft 5.5 in (1.359 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.

Rebuilding

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 and 1906, 62 to Class D between 1906 and 1909, with the remaining 34 rebuilt by Charles Bowen Cooke to Class C1 between 1909 and 1912.

All Class D locomotives were later rebuilt to Class G1. Some of them, rebuilt to Class G2A, were still running in 1962.

Classification

The LNWR letter classification system for 8 coupled engines (A, B, C, etc.) was introduced in 1911.