GWR 3300 Bulldog Class 4-4-0

The GWR 3300 Bulldog Class was a fleet of 156 4-4-0 express passenger steam locomotives designed jointly by William Dean and George Jackson Churchward for the Great Western Railway. Built at Swindon Works between 1899 and 1910, the class was the GWR's standard 4-4-0 in the years before the Star and Castle 4-6-0s took over the heaviest expresses. The Bulldog was named after the prototype, with the class also carrying a wide variety of British and Empire town and county names. None of the 156 engines survived into preservation, although the Bulldog's frames lived on as the basis of the later GWR Dukedog Class of 1936.

The Bulldog was effectively the larger-boilered development of the older GWR Duke class, fitted with the new Standard No. 2 boiler that was the GWR's mid-power workhorse for the next thirty years. The class was widely allocated across the GWR system, with major sheds at Old Oak Common, Bristol Bath Road, Plymouth Laira, Cardiff Canton, Wolverhampton Stafford Road, and Worcester. They worked secondary expresses on the Birmingham, Worcester, and Welsh routes.

The Bulldogs were progressively displaced from the heaviest expresses by the Star Class from 1907 and the Castle Class from 1923, but they remained on secondary work into the 1930s and 1940s. Withdrawals were concentrated in the 1930s and the last Bulldogs were withdrawn in the early 1950s.

None of the 156 Bulldogs survived into preservation. The class was scrapped at Swindon Works between the 1930s and the early 1950s. The Bulldog's influence, however, did not entirely die: 14 Bulldog frames were used as the basis of the GWR Dukedog 4-4-0 (3200 Class) of 1936, and one of those Dukedogs (9017 Earl of Berkeley) survives in preservation at the Bluebell Railway. A Bulldog frame is, in a sense, preserved at the Bluebell as part of that Dukedog.