BR Standard Class 4MT 4-6-0

BR Standard Class 4MT 4-6-0

BR Standard Class 4MT 4-6-0 No. 75022 at Gloucester Eastgate in 1959 (photo: Ben Brooksbank)

The British Railways standard class 4MT 4-6-0 tender steam locomotives were designed at Brighton works under the oversight of R. A. Riddles and built at Swindon Works between 1951 and 1957. 80 were built (numbered 75000 to 75079) for mixed traffic use on secondary routes where BR standard class 5 and their predecessors, the LMS Black Fives, would be too heavy. They were initially allocated to the BR London Midland, Western and Southern Regions.

The design was essentially a tender version of the BR Standard Class 4 2-6-4T. The locomotives were coal fired, had two outside cylinders, Walschaerts valve gear and used BR1B (SR), BR2 or BR2A tenders.

The class was withdrawn between 1964 and 1968, six have been preserved:

75014, 75027, 75029, 75069, 75078 & 75079.

BR Standard Class 4MT 4-6-0 specification

Length: 60 ft 0 in (18.29 m)
Width: 8 ft 9½ in (2.68 m)
Height: 13 ft 0 in (3.96m)
Gauge: 4 ft 8½ in (1.435m)
Driving wheel dia: 5 ft 8 in (1 727mm)
Boiler Pressure: 225 psi (1.55 MPa)
Cylinders: 18 x 28 in (457 x 711mm)
Loco weight: 69 tons 0 cwt (70.017 tonnes)
Tractive effort: 25,100 lbf (111.6 kN)

Last updated 29/03/14