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 typeSteam
DesignerChristopher Cumming
BuilderHawthorn Leslie
Serial number3172–3173
Build date1916
Total produced2
Specifications
Configuration:
​
 • Whyte4-4-0
 • UIC2′B
Gauge4 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 weight54 long tons ​19 1⁄2 cwt (125,400 lb or 56.9 t)
Fuel typeCoal
Boiler4 ft 8 9⁄16 in (1.44 m) diameter
Boiler pressure175 psi (1.21 MPa)
Heating surface1,140 sq ft (106 m2)
Superheater:
​
 • TypeRobinson
 • Heating area180 sq ft (17 m2)
CylindersTwo, outside
Cylinder size20 in × 26 in (508 mm × 660 mm)
Valve gearWalschaerts
Valve typeInside admission piston valves
Train brakesVacuum
Performance figures
Tractive effort20,627 lbf (91.8 kN)
Career
OperatorsHR, LMS
Power classLMS: 3P
NumbersHR: 73–74,
LMS: 14522–14523
Withdrawn1934–1936
DispositionBoth 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.NameLMS No.WithdrawnNotes
73Snaigow14522April 1936
74Durn14523April 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into London, Midland and Scottish Railway ownership in 1923, but neither lasted until nationalisation, as both were withdrawn and scrapped as non-standard engines in the mid-1930s.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
    • Baxter, Bertram (1984). Baxter, David (ed.). British Locomotive Catalogue 1825–1923, Volume 4: Scottish and remaining English Companies in the LMS Group. Ashbourne, Derbyshire: Moorland Publishing Company.
    • Casserley, H. C. & Johnston, Stuart W. (1974) [1966]. Locomotives at the Grouping 3: London, Midland and Scottish Railway. Shepperton, Surrey: Ian Allan. p. 146. ISBN 0-7110-0554-0.
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