Queen Class

The GWR Queen Class was a series of 2-2-2 single-driver express passenger locomotives designed by Joseph Armstrong, Locomotive Superintendent of the Great Western Railway from 1864 to 1877, and built at Swindon Works from 1873 as the GWR's standard narrow-gauge express type following the conversion of the GWR main line from Brunel's 7 ft broad gauge to the standard 4 ft 8½ in gauge. The Queen Class represented Armstrong's contribution to the post-broad-gauge GWR's express locomotive fleet, providing capable and elegant single-driver express engines for the Paddington–Bristol, Paddington–Birmingham, and associated principal express services during the transitional period of the 1870s and early 1880s.

Armstrong inherited a complex situation at Swindon: the GWR was in the process of converting its extensive broad-gauge network to standard gauge, a massive engineering undertaking that would not be completed until 1892, and the locomotive fleet needed to encompass both broad and standard gauge types simultaneously. The Queen Class addressed the standard-gauge express requirement with a series of attractive 2-2-2 single-drivers in the tradition of Victorian express practice, combining adequate power for the Paddington expresses with the smooth, high-speed running characteristic of the single-driver wheel arrangement on the level stretches of the GWR's former broad-gauge main lines.

Armstrong's Queen Class gave reliable service through the 1870s and early 1880s before being displaced by Dean's more capable express types. None was preserved, but the GWR single-driver express tradition is represented by the replica of the broad-gauge Iron Duke at the National Railway Museum and by Gooch's broad-gauge express legacy documented at STEAM in Swindon.