The nominally Collett-designed 5400 Class had 5 ft 2 in (1.575 m) driving wheels for greater top speed with autocoaches, and were all fitted with the required remote control gear for working the push-pull autotrains. They had a modern cab and a larger bunker. They were frequently seen on inner suburban routes from Paddington.
The prototype was not a new engine, being rebuilt from 2021 Class No. 2062 in 1930. It was given larger wheels, splashers and coal bunker, and the new units from 1931 onwards had the rounded-edge cab as well. This cab style was to be fitted to all subsequent GWR pannier tank designs, including the later derivations of the 5700 Class.
Despite its success, the prototype, No. 5400, had a short life, lasting only two years before being scrapped. It was used as a parts donor for an all-new engine with the same number. 25 locomotives were built and they were numbered 5400–5424.
The GWR 6400 Class and 7400 Class that followed were closely related, fundamentally differing only in wheel size – 4 ft 7+1⁄2 in (1.410 m) – and, in the case of the 74xx, a higher boiler pressure of 180 psi (1.2 MPa). This produced two general purpose classes with wide route availability. The 6400 was auto-fitted but more suitable for hilly routes than the 5400. The 7400 was not auto-fitted.
See also
GWR 0-6-0PT – list of classes of GWR 0-6-0 pannier tank, including table of preserved locomotives
Allcock, N. J.; Davies, F. K.; le Fleming, H. M.; Maskelyne, J. N.; Reed, P. J. T.; Tabor, F. J. (1968) [1951]. White, D. E. (ed.). The Locomotives of the Great Western Railway, part one: Preliminary Survey. Kenilworth: RCTS.
le Fleming, H. M. (April 1958). White, D. E. (ed.). The Locomotives of the Great Western Railway, part five: Six-coupled Tank Engines. RCTS. ISBN0-901115-35-5. OCLC500544510.
Whitehurst, Brian (1973). Great Western Engines, Names, Numbers, Types and Classes (1940 to Preservation). Oxford, UK: Oxford Publishing Company. ISBN978-0-9028-8821-0. OCLC815661.