BR Standard Class 4MT 2-6-4T

BR Standard Class 4MT 2-6-4T

BR Standard Class 4MT 2-6-4T No. 80104 at Norden, Swanage Railway in 2010 (photo: Mick Stock)

The British Railways standard class 4MT 2-6-2T side tank steam locomotives were designed at Brighton under the oversight of R. A. Riddles and built at Brighton, Derby and Doncaster works between 1951 and 1956. 155 were built for commuter and outer suburban services on all regions except the Western and were numbered 80000 to 80154.

The locomotives were based on the ex-LMS Fairburn 2-6-4T with some modifications, they were coal fired, had two outside cylinders and Walschaerts valve gear.

The first of the class to be withdrawn was 80103 due to a broken mainframe. The remainder were withdrawn between 1964 and 1967, although 80002 remained in Glasgow past the end of steam haulage until 1969 on carriage heating duties. Remarkably, 15 have been preserved; 80002, 80064, 80072, 80078, 80079, 80080, 80097, 80098, 80100, 80104, 80105, 80135, 80136, 80150 & 80151. This is the highest number of any BR standard class.

BR Standard Class 4MT 2-6-4T specification

Length: 44 ft 10 in (13.67 m)
Width: 8 ft 9¼ in (2.67 m)
Height: 13 ft 0 in (3.96m)
Gauge: 4 ft 8½ in (1.435m)
Driving wheel dia: 5 ft 8 in (1.727 m)
Boiler Pressure: 225 psi (1.55 MPa)
Cylinders: 18 × 28 in (457 × 711 mm)
Weight: 88 tons 10 cwt (89.92 tonnes)
Tractive effort: 25,100 lbf (111.7 kN)

Last updated 28/10/11