The first Locomotives of the Great Western Railway (GWR) were specified by Isambard Kingdom Brunel but Daniel Gooch was soon appointed as the railway's Locomotive Superintendent. He designed several different broad gauge types for the growing railway, such as the Firefly and later Iron Duke Class 2-2-2s. In 1864 Gooch was succeeded by Joseph Armstrong who brought his standard gauge experience to the workshops at Swindon. To replace some of the earlier locomotives, he put broad gauge wheels on his standard gauge locomotives and from this time on all locomotives were given numbers, including the broad gauge ones that had previously carried just names. Joseph Armstrong's early death in 1877 meant that the next phase of motive power design was the responsibility of William Dean, his assistant and successor. Dean went on to develop express 4-4-0 types, but the familiar 4-6-0s of later years were initially introduced by the next engineer, George Jackson Churchward. He was also responsible for the introduction of self-propelled Steam Rail Motors for suburban and light branch line passenger trains. Next came Charles Collett in 1921; he standardised the many types of locomotives then in service, producing the iconic Castle and Kings. He also introduced diesel power in the form of streamlined rail cars in 1934. The final engineer was Frederick Hawksworth who took control in 1941 and produced GWR-design locomotives until after nationalisation in 1948. The GWR expanded rapidly from 1854 by amalgamating with other railways. In 1876 most of the remaining broad gauge companies became a part of the GWR. The Railways Act 1921 finally brought most of the remaining independent companies in the area under its control. Many early locomotives were replaced by standard GWR designs, but many others were rebuilt using standardised components. Livery For most of the period of its existence, the GWR painted its locomotives a middle chrome green. They initially had Indian red frames but this was later changed to black. Name and numberplates were generally of polished brass with a black background, and chimneys often had copper rims or "caps". Great Western Railway locomotives Isambard Kingdom Brunel (1835 - 1837) The GWR's first locomotives were specified by Isambard Kingdom Brunel but did not prove too successful. In order to meet his demands some novel ideas were tried such as the Haigh Foundry's geared locomotives and TE Harrison's Hurricane and Thunderer which had the engine and boiler on separate