Highland Railway Clan Class

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Highland Railway Clan class
No. 49 Clan Campbell
Type and origin Power type Steam Designer Christopher Cumming Builder R. & W. Hawthorn, Leslie and Company Serial number 3329–3332, 3443–3446 Build date 1919 (4), 1921 (4) Total produced 8
Specifications Configuration: ​  • Whyte 4-6-0  • UIC 2′C h2 Gauge 4 ft 8+1⁄2 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 weight 63.25 long tons (64.26 t; 70.84 short tons) Tender weight 42 long tons (43 t; 47 short tons) Firebox: ​  • Grate area 25.5 sq ft (2.37 m2) Boiler 4 ft 9+3⁄16 in (1.453 m) diameter, with 1+1⁄8 in (29 mm) taper Boiler pressure 175 psi (1.21 MPa) Heating surface 1,467 sq ft (136.3 m2) Superheater: ​  • Type Robinson  • Heating area 256 sq ft (23.8 m2) Cylinders Two, outside Cylinder size 21 in × 26 in (533 mm × 660 mm) Valve gear Walschaerts Valve type 10 in (254 mm) piston valves
Performance figures Tractive effort 23,688 lbf (105.37 kN)
Career Operators HR → LMS → BR Power class LMS/BR: 4P Numbers HR: 49, 51–57 LMS: 14762–14769 BR: 54767 Withdrawn 1943–1950 Disposition All scrapped

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.

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).

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.

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

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.

• 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.