LNWR Class G

LNWR Class G
File:LNWR locomotive No. 2653 G Class.jpg No. 2653 in photographic grey livery
Type and origin Power type Steam Designer George Whale Builder Crewe Works Build date 1910 Total produced 60 Rebuilder Crewe Works Rebuild date 1906–17 Number rebuilt 32 from Class B
Specifications Configuration: ​  • Whyte 0-8-0  • UIC D n2 Gauge 4 ft 8+1⁄2 in (1,435 mm) Driver dia. 4 ft 5.5 in (1.359 m) Fuel type Coal Boiler pressure 160 psi (1.10 MPa) Heating surface 2,043.25 sq ft (189.824 m2) Cylinders 2 inside Cylinder size 20.5 by 24 inches (520 mm × 610 mm)
Career Operators London and North Western Railway, London, Midland and Scottish Railway Disposition 1 rebuilt to Class G1 1912 91 rebuilt to Class G1 1920–37

The London and North Western Railway (LNWR) Class G were several related classes of 0-8-0 steam locomotives. These 0-8-0s were the principal engines for freight traffic on the latter-day London & North Western.

History

32 of this class were rebuilt from 4-cylinder compound Class B between 1906 and 1917. The outside high-pressure cylinders were removed and the inside low-pressure cylinders were re-used, in their original position, to make a two-cylinder simple expansion engine. The boiler pressure was reduced from 200 psi to 160 psi to keep the tractive effort approximately the same. The rebuilt engines retained their old numbers. Additionally, 60 new Gs were built in 1910. The rebuilt engines were easily distinguished from the new builds by having "piano fronts".

Rebuilding

The first of the class, LNWR No. 2653, was rebuilt to Class G1 in 1912. The remaining 91 engines were inherited by the LMS in 1923. LMS numbers were 9077-9144. The LMS rebuilt them all to Class G1 between May 1924 and 1937, thus rendering the class extinct.

Further reading

• Bob Essery & David Jenkinson An Illustrated Review of LMS Locomotives Vol. 2 Absorbed Pre-Group Classes Western and Central Divisions
• Willie Yeadon, Yeadon's Compendium of LNWR Locomotives Vol 2 Goods Tender Engines