The British Railways standard class 3MT 2-6-2T Prairie side tank steam locomotives were designed and built at Swindon works under the oversight of R. A. Riddles between 1952 and 1955. 45 were built for local services on the North Eastern, London Midland, Western and Southern Regions and were numbered 82000 to 82044.
The design was essentially a hybrid of the LMS Ivatt Class 4 with a boiler derived from those fitted to the GWR Large Prairie 2-6-2T and 5600 Class 0-6-2T tank engines. The locomotives were coal fired, had two outside cylinders and Walschaerts valve gear.
The class was withdrawn between 1964 and 1967, none were preserved. However, the 82045 Locomotive Trust is building a new BR standard class 3 tank locomotive which will carry the next number in the original sequence. The Trust believes that the locomotive will be ideal for heritage railways due to it’s spritely performance and modest axle load.
BR Standard Class 3MT 2-6-2T specification
Length: 40 ft 10½ in (12.46m)
Width: 8 ft 6 in (2.59m)
Height: 13 ft 0 in (3.96m)
Gauge: 4 ft 8½ in (1.435m)
Driving wheel dia: 5 ft 3 in (1 600mm)
Boiler Pressure: 200 psi (1.38 MPa)
Cylinders: 17½ x 26 in (444 x 660mm)
Weight: 73 tons 10 cwt (74.679 tonnes)
Tractive effort: 21,490 lbf (95.6 kN)
Last updated 28/10/11