The GWR 1901 Class was a class of 120 small 0-6-0ST steam locomotives. Numbered 1901–2020, they were designed by George Armstrong (responsible to William Dean at Swindon) and built at the Wolverhampton railway works, England, of the Great Western Railway between 1881 and 1895. They had wheels of 4 ft 0 in (1.219 m) diameter and a coupled wheelbase of 13 ft 8 in (4.17 m).