GWR diesel shunters
The Great Western Railway purchased two diesel shunters, and ordered a further seven immediately prior to Nationalisation, which were delivered to British Rail in 1948–49. The two shunters used by the GWR were numbered 1 and 2, while a series commencing at 501 was planned for the new locomotives ordered in the 1940s. British Rail numbered 2 and the new locomotives in a series commencing at 15100. 1. This locomotive was built by Fowler in 1933 and was used at Swindon works. It was an 0-4-0 diesel mechanical shunter with a engine, diameter wheels and  a wheelbase of . It was very similar to the London, Midland and Scottish Railway's departmental locomotive number 2, which was built a couple of years later. It was withdrawn in 1940 and sold to the Ministry of Supply. 2 / 15100. This locomotive was built by Hawthorn Leslie in 1936 and allocated to Swindon. It was a 0-6-0 diesel electric shunter, very similar to the London Midland and Scottish Railway 7069 class (later British Rail Class D3/6), and with a close family resemblance to the Southern Railway Maunsell 350 hp DMS (SR 1 - SR3). It was renumbered 15100  by British Rail in 1948, withdrawn by them in 1965 and scrapped in early 1966. 501 / 15107. Brush/Petter 360 bhp 502-507 / 15101-15106. English Electric 350 bhp