GWR 517 Class
Design and development
George Armstrong (Joseph Armstrong's brother and Wolverhampton works manager) designed in 1868 a small 0-4-2 tank engine for GWR branch-line and pickup-goods work. With 5 ft coupled wheels, side tanks, a rear bunker, and the GWR's standard domeless boiler, the 517 class was simple, economical, and ideally suited to country-branch operating. Production continued at Wolverhampton between 1868 and 1885, totalling 156 engines.
Service and withdrawals
The 517s worked GWR branch lines across the system from 1868. Many were rebuilt with larger boilers under Dean and Churchward, and a number lasted into BR days, the last withdrawn in 1956 — 88 years after the first was built. None were preserved, but the design directly inspired Collett's later 14xx class auto-tanks of 1932.
Identification features
Compact 0-4-2 tank engine with 5 ft coupled wheels, leading driving axle, trailing carrying axle, side tanks, and rear bunker. GWR domeless boiler with safety valve over the firebox.
Notable locomotives
- Various — none preserved