Highland Railway Clan Class

The Highland Railway's Clan Class was a class of passenger 4-6-0 steam locomotives designed by Christopher Cumming. The design is derived from that of the slightly earlier Clan Goods although the similarity is more visual than real. The first four were built in 1919, and the remaining four in 1921.

Highland Railway Clan class
No. 49 Clan Campbell
Type and origin
Power typeSteam
DesignerChristopher Cumming
BuilderR. & W. Hawthorn, Leslie and Company
Serial number3329–3332, 3443–3446
Build date1919 (4), 1921 (4)
Total produced8
Specifications
Configuration:
  Whyte4-6-0
  UIC2′C h2
Gauge4 ft 8+12 in (1,435 mm) standard gauge
Leading dia.3 ft 0 in (0.914 m)
Driver dia.6 ft 0 in (1.829 m)
Loco weight63.25 long tons (64.26 t; 70.84 short tons)
Tender weight42 long tons (43 t; 47 short tons)
Firebox:
  Firegrate area
25.5 sq ft (2.37 m2)
Boiler4 ft 9+316 in (1.453 m) diameter, with 1+18 in (29 mm) taper
Boiler pressure175 psi (1.21 MPa)
Heating surface1,467 sq ft (136.3 m2)
Superheater:
  TypeRobinson
  Heating area256 sq ft (23.8 m2)
CylindersTwo, outside
Cylinder size21 in × 26 in (533 mm × 660 mm)
Valve gearWalschaerts
Valve type10 in (254 mm) piston valves
Performance figures
Tractive effort23,688 lbf (105.37 kN)
Career
OperatorsHRLMSBR
Power classLMS/BR: 4P
NumbersHR: 49, 51–57
LMS: 14762–14769
BR: 54767
Withdrawn1943–1950
DispositionAll scrapped

Dimensions

They had 21-by-26-inch (533 by 660 mm) cylinders outside with outside Walschaerts valve gear, 6 ft 0 in (1.83 m) driving wheels and a boiler pressured to 175 psi (1.21 MPa). Weight was 62 long tons 5 cwt (139,400 lb or 63.2 t) for the locomotive and 42 long tons (43 t; 47 short tons) for the tender. Piston valve diameter is given as 10 inches (254 mm) (quite large for the period), but they had the conventional short lap, short travel valves. Bearing in mind that they probably spent a large part of their time slogging uphill or coasting down this was probably not too important. Total evaporative heating surface is given as 1,467 sq ft (136.3 m2), plus 256 sq ft (23.8 m2) for the Robinson type superheater, and grate area as 25.5 sq ft (2.37 m2).

Oil firing

Early in 1921 Clan Stewart was used for experiments with oil firing. This seems to have been successful, but was not applied to any other locomotives. Just when Clan Stewart reverted to coal operation does not seem to be recorded.

Transfer to LMS

The locomotives passed to the London, Midland and Scottish Railway (LMS) in 1923. The LMS classified them '4P'.

Transfer to BR

Two survived into British Railways (BR) hands in 1948, but only Clan Mackinnon received its BR number. Some of the Clan names were later reapplied to the BR Standard Class 6.

Numbering

HR NumberNameBuiltLMS NumberBR numberWithdrawnNotes
49Clan Campbell191914762June 1947
51Clan Fraser191914763August 1944
52Clan Munro19191476454764February 1948BR number not applied
53Clan Stewart191914765February 1945
54Clan Chattan192114766April 1944
55Clan Mackinnon19211476754767January 1950
56Clan Mackenzie192114768March 1945
57Clan Cameron192114769November 1943

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. p. 202.
    • Casserley, H. C. & Johnston, Stuart W. (1974) [1966]. Locomotives at the Grouping 3: London, Midland and Scottish Railway. Shepperton, Surrey: Ian Allan. p. 152. ISBN 0-7110-0554-0.


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