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Caledonian classes 113 and 72 “Dunalastair V”
London, Midland & Scottish class 3P
Great Britain | 1916 | 48 produced
No. 14493 of the LMS in August 1948 at Inverness
No. 14493 of the LMS in August 1948 at Inverness
Ben Brooksbank

In 1916, William Pickersgill had 16 class 72 4-4-0 express locomotives built. From 1920, 32 more Class 113s followed, which had a slightly smaller boiler and slightly larger cylinders. Technically, they could be considered the successors to McIntosh's Dunalastair range, which is why they were unofficially called “Dunalastair V”. Like their predecessors, they had the cylinders and valve gear on the inside of the frame, but a superheater straight from the factory. They reportedly performed well, which increased their lifespans. So all members of the class came to the LMS in 1923 and to the British Railways in 1948. One was scrapped in 1953 after an accident and the rest were only retired between 1959 and 1962.

ManufacturerSt. Rollox, Armstrong Whitworth, North British
Axle config4-4-0 (American) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase24 ft 4 in
Fixed wheelbase9 ft 9 in
Service weight137,200 lbs
Adhesive weight89,040 lbs
Total weight241,360 lbs229,633 lbs
Axle load44,575 lbs
Water capacity5,044 us gal
Fuel capacity14,784 lbs (coal)
Power sourcesteam
Estimated power1,050 hp (783 kW)1,000 hp (746 kW)
Optimal speed33 mph30 mph
Starting effort20,400 lbf21,433 lbf
Power Plant
Driver diameter78 in
Boiler pressure180 psi
Expansion typesimple
Cylinderstwo, 20 x 26 intwo, 20 1/2 x 26 in
Grate area20 sq ft20.7 sq ft
Firebox area145 sq ft144 sq ft
Tube heating area1,220 sq ft1,185 sq ft
Evaporative heating area1,365 sq ft1,329 sq ft
Superheater area295 sq ft200 sq ft
Total heating area1,660 sq ft1,529 sq ft
Calculated Values
steam locomotive
William Pickersgill
last changed: 08/2023

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