The British Railways standard class 5MT 4-6-0 tender steam locomotives were designed at Doncaster works under the oversight of R. A. Riddles and built at Derby Works (130) and Docaster Works (42) between 1951 and 1957. 172 were built (numbered 73000 to 73171) for general mixed traffic use on all BR Regions replacing some of the older pre-nationalisation 4-6-0s.
The design was essentially a standardised version of the LMS Stanier Class 5 2-6-0 (Black Five) which was still being built by BR until 1951, the most visible differences being a 2 inch increase in driving wheel diameter, higher runing plates and modern cab. The locomotives were coal fired and had two outside cylinders. Walschaerts valve gear was fitted to most of the class but 30 (73125 – 73154) were experimentally fitted with Caprotti rotary cam poppet valve gear. BR1, BR1B, BR1C, BR1F, BR1H and BR1G tenders with differing capacities were used with the class 5s.
The class was withdrawn between 1964 and 1968, five have been preserved:
73050, 73082 Camelot, 73096, 73129 & 73156.
BR Standard Class 5MT 4-6-0 specification
Length: 62 ft 7 in (19.08 m)
Width: 8 ft 9 in (2.67 m)
Height: 13 ft 0 in (3.96m)
Gauge: 4 ft 8½ in (1.435m)
Driving wheel dia: 6 ft 2 in (1 880mm)
Boiler Pressure: 225 psi (1.55 MPa)
Cylinders: 19 x 28 in (483 x 711mm)
Loco weight: 76 tons 4 cwt (77.423 tonnes)
Tractive effort: 26,120 lbf (116.2 kN)
Last updated 02/11/11