Tags: Locomotive.
The GWR 633 Class were 0-6-0 tank locomotives designed by George Armstrong and built at the Wolverhampton railway works of the Great Western Railway in 1871-2. Unusually they had side (not saddle) tanks and inside frames with wheels of 4 ft 6½ in diameter and a wheelbase of 15 ft 6 in. The weight was 34 tons 12 cwt. There were twelve locomotives numbered 633-644.