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London, Midland & Scottish Ivatt class 2 2-6-0
Great Britain | 1946 | 128 produced
46459 in 1951 at Workington Depot
46459 in 1951 at Workington Depot
Ben Brooksbank / LMS Ivatt 2MT 2-6-0 at Workington Locomotive Depot

The steam locomotives built by the LMS after the Second World War also included Class 2 tender locomotives for mixed service, which were intended to replace older 0-6-0 locomotives. The choice fell on the 2-6-0 wheel arrangement in order to be able to easily increase power and speed. George Ivatt, who had recently been chief engineer of the LMS at the time, used his newly designed tank locomotive with a 2-6-2T wheel arrangement as the basis. Compared to the tank locomotive, the water supply of the tender locomotive was increased from 1,350 to 3,000 gallons and the coal supply from 3 to 4 long tons. Thus, these locomotives could cover large distances, but with a weight of less than 50 long tons, they could be used universally.

Only 20 examples were built by the LMS in 1947 and 1948 and were numbered 6400 to 6419. British Railways 40,000 to the running numbers and continued production. A total of 128 pieces were made by 1953, which now bore the numbers 46400 to 46527. Beginning with 46465, the diameter of the cylinders was increased by one inch, increasing the locomotive's weight and pulling power. They formed the basis for the BR standard class 2 2-6-0, which was built until 1956. Both the Ivatt locos and the standard class were nicknamed “Mickey Mouse”. The end of service of the 128 locomotives of the original class was between 1961 and 1967 and today seven units are still preserved, six of which are or were operational and some were also used intensively on main routes.

Variant1946 variant1951 variant
General
Built1946-1953
ManufacturerCreweDarlington, Swindon
Axle config2-6-0 (Mogul) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length53 ft 1 3/4 in
Wheelbase22 ft 3 in
Fixed wheelbase13 ft 9 in
Total wheelbase44 ft 3 in
Service weight105,504 lbs108,527 lbs
Adhesive weight88,185 lbs90,389 lbs
Total weight182,000 lbs185,023 lbs
Axle load29,762 lbs30,424 lbs
Water capacity3,603 us gal
Fuel capacity8,960 lbs (coal)
Power
Power sourcesteam
Estimated power850 hp (634 kW)
Optimal speed31 mph
Starting effort17,408 lbf
Power Plant
Driver diameter60 in
Boiler pressure200 psi
Expansion typesimple
Cylinderstwo, 16 x 24 in
Boiler
Grate area17.5 sq ft
Firebox area101 sq ft
Tube heating area924 sq ft
Evaporative heating area1,025 sq ft
Superheater area134 sq ft124 sq ft
Total heating area1,159 sq ft1,149 sq ft
Calculated Values
steam locomotive
freight
Henry George Ivatt
last changed: 01/2022
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