The LMS class 2F 2-6-0 Mogul tender steam locomotives were designed by H. G. Ivatt for light mixed traffic duties. Construction of the 128 strong class commenced in 1946, only 20 being built by the LMS at Crewe Works. The remainder were built by BR at Crewe (45), Darlington (38) and Swindon (25) between 1948 and 1953. The LMS-built examples were numbered 6400 to 6419 and renumbered 46400 to 46419 by BR, the remainder followed the sequence up to 46527. BR classification was 2MT.
It was essentially a tender version the Ivatt-designed LMS Class 2P 2-6-2T being introduced at the same time but with greater range due to the higher coal and water capacity. The locomotives had two outside cylinders and were fitted with Walschaerts valve gear. Slightly larger cylinders were used on the Darlington and Swindon built locomotives (46465 onwards) yielding 1,100 lbf extra tractive effort.
In service the Crewe-built locomotives were allocated to the London Midland Region, those built at Darlington to the London Midland, Eastern and North Eastern regions and the Swindon batch to the Western Region. After an initial draughting problem was rectified, they were successful and became the basis for the BR Standard Class 2MT 2-6-0 design.
The class was withdrawn between 1961 and 1967, seven have been preserved; Nos. 46428, 46441, 46443, 46447, 46464, 46512 and 46521.
LMS Ivatt Class 2F 2-6-0 specification
Length: 53 ft 1¾ in (16.199 m)
Gauge: 4 ft 8½ in (1,435 mm)
Driving wheel dia: 5 ft 0 in (1 524mm)
Boiler Pressure: 200 psi (1.38 MPa)
Cylinders: 16 x 24 in (406 x 610mm)
[46465 onwards: 16½ x 24 in (419 x 610mm)]
Loco weight: 47 tons 2 cwt (47.856 tonnes)
Tractive effort: 17,410 lbf (77.444 kN)
[46465 onwards: 18,510 lbf (82.336 kN)]
Last updated 14/11/11