Highland Railway Cumming 4-4-0 Class

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Highland Railway Cumming 4-4-0
Type and origin
Power typeSteam
Designer Christopher Cumming
Builder Hawthorn Leslie
Serial number3172–3173
Build date1916
Total produced2
Specifications
Configuration:
   Whyte 4-4-0
   UIC 2′B
Gauge 4 ft 8 12 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 12 cwt (125,400 lb or 56.9 t)
Fuel typeCoal
Boiler4 ft 8 916 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)
Cylinders Two, outside
Cylinder size 20 in × 26 in (508 mm × 660 mm)
Valve gear Walschaerts
Valve typeInside admission piston valves
Train brakes Vacuum
Performance figures
Tractive effort 20,627 lbf (91.8 kN)
Career
Operators HR, LMS
Power classLMS: 3P
NumbersHR: 73–74,
LMS: 14522–14523
Withdrawn1934–1936
DispositionBoth 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

Contents

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into London, Midland and Scottish Railway ownership in 1923, but neither lasted until nationalisation, as both were withdrawn and scrapped as non-standard engines in the mid-1930s.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.

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