Highland Railway Cumming 4-4-0 Class

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 4-4-0
UIC class 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Withdrawn 1934–1936
Disposition Both scrapped

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

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HR No. Name LMS No. Withdrawn Notes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into London, Midland and Scottish Railway ownership in 1923, but neither lasted until nationalisation, as both were withdrawn and scrapped as non-standard engines in the mid-1930s.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.

References

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