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London, Midland & Scottish Stanier Mogul
later class 5MT
Great Britain | 1933 | 40 produced
Die Lokomotive, November 1936

In 1933 the LMS ordered 40 more examples of the “Hughes Crab”, which had last been built in their works in Crewe. By this time, William Stanier had been chief engineer at LMS for two years. Since he brought experience from the GWR and still saw room for improvement for the locomotives, the locomotives were not built directly to the original design. As the greatest innovation, Stanier introduced the so-called “taper boiler”, a boiler that tapers towards the front. This not only saved weight, but also ensured better water circulation. The new boiler also had a pressure of 225psi compared to 180psi on the Horwich Mogul. Thanks to the higher boiler pressure, the diameter of the cylinders could be reduced, but at the same time the piston stroke was increased.

Preserved No. 42968 in 2009 at Kidderminster
Preserved No. 42968 in 2009 at Kidderminster
Tony Hisgett

Due to the changes, the locomotives were given a new designation, but like their predecessors, they were also assigned to power class 5 and were used for the same tasks as these. These locomotives also got the narrower standard tender of the Derby Works. From the 14th locomotive, a slightly modified boiler was installed. A total of 40 pieces were made in the short period between October 1933 and March 1934. No further examples were built, as Stanier immediately wanted to build power class 5 mixed-traffic locomotives with a 4-6-0 wheel arrangement, from which his famous “Black Five” arose. In contrast to the Crab, the first new Moguls were not phased out until 1963, but the last engines were also phased out in 1967. Only the penultimate locomotive built with the BR number 42968 has been preserved today. This was operational until 2013 and then came to a larger one Overhaul still ongoing in 2021.

General
Built1933-1934
ManufacturerCrewe
Axle config2-6-0 (Mogul) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length59 ft 10 3/4 in
Wheelbase25 ft 6 in
Fixed wheelbase16 ft 6 in
Service weight155,680 lbs
Adhesive weight134,176 lbs
Total weight250,208 lbs
Axle load45,136 lbs
Water capacity4,203 us gal
Fuel capacity11,200 lbs (coal)
Power
Power sourcesteam
Estimated power1,400 hp (1,044 kW)
Optimal speed34 mph
Starting effort26,288 lbf
Power Plant
Driver diameter66 in
Boiler pressure225 psi
Expansion typesimple
Cylinderstwo, 18 x 28 in
Boiler
Grate area27.8 sq ft
Firebox area155 sq ft
Tube heating area1,479 sq ft
Evaporative heating area1,634 sq ft
Superheater area232 sq ft
Total heating area1,866 sq ft
Calculated Values
steam locomotive
passenger
freight
William Arthur Stanier
last changed: 01/2022
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