GWR 439 Class
The 439 Class, nicknamed the Bicycle class because of its unusual appearance, was a series of six 2-4-0 mixed-traffic engines designed by Joseph Armstrong for the Great Western Railway, and built at Swindon Works in 1868.
The locomotives 
Numbered in the series 439-444, the running plate of these inside-framed locomotives was raised, without splashers, above each of the large (6'1") driving wheels, rather giving the impression of bicycle wheels and mudguards. The "Bicycles" worked at Northern Division sheds, running between Wolverhampton and Chester. Most of the class was renewed at Wolverhampton under George Armstrong in 1885/6; the renewals were more conventional in appearance, with large splashers, but the class's nickname stuck. At first the renewals also ran on the same routes as their predecessors, though later some were transferred further south.
- Tabor 1956, pp. D26=D27.
- Tabor, F. J. (February 1956). In White, D. E. The Locomotives of the Great Western Railway, part four: Six-wheeled Tender Engines. Kenilworth: RCTS.