Highland Railway Cumming 4-4-0 Class

The Highland Railway Cumming 4-4-0 class was a pair of 4-4-0 steam locomotives designed by Christopher Cumming, the Locomotive Superintendent of the Highland Railway

Highland Railway Cumming 4-4-0
Type and origin Power type Steam Designer Christopher Cumming Builder Hawthorn Leslie Serial number 3172–3173 Build date 1916 Total produced 2
Specifications Configuration: ​  • Whyte 4-4-0  • UIC 2′B Gauge 4 ft 8+1⁄2 in (1,435 mm) Leading dia. 3 ft 3 in (0.991 m) Driver dia. 6 ft 3 in (1.905 m) Loco weight 54 long tons 19+1⁄2 cwt (125,400 lb or 56.9 t) Fuel type Coal Boiler 4 ft 8+9⁄16 in (1.44 m) diameter Boiler pressure 175 psi (1.21 MPa) Heating surface 1,140 sq ft (106 m2) Superheater: ​  • Type Robinson  • Heating area 180 sq ft (17 m2) Cylinders Two, outside Cylinder size 20 in × 26 in (508 mm × 660 mm) Valve gear Walschaerts Valve type Inside admission piston valves Train brakes Vacuum
Performance figures Tractive effort 20,627 lbf (91.8 kN)
Career Operators HR, LMS Power class LMS: 3P Numbers HR: 73–74, LMS: 14522–14523 Withdrawn 1935–1936 Disposition Both scrapped

Dimensions

They had 20-by-26-inch (510 mm × 660 mm) outside cylinders with Walschaerts valve gear, 6 ft 3 in (1.905 m) driving wheels and a boiler pressed to 175 lbf/in² (1.21 MPa). Weight was a half-hundredweight short of 56 long tons (125,400 lb or 56.9 t).

Numbering

Table of engines

HR No.	Name	LMS No.	Withdrawn	Notes
73	Snaigow	14522	April 1936
74	Durn	14523	April 1935

Transfer to LMS

Both survived into London, Midland and Scottish Railway ownership in 1923, but neither lasted until nationalisation, as both were withdrawn and scrapped as non-standard engines in the mid-1930s. The LMS had classed them as 3P.