Highland Railway Cumming 'Clan' class 4-6-0

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.
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 Clan Class 6.
14762 Clan Campbell
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Highland Railway C.Cumming Clan class 4-6-0 - Railway-Photography
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14762 Clan Campbell Wick c1936

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14765 Clan Stewart
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14765 Clan Stewart Perth North shed April 1944
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14765 Clan Stewart Stirling May 1935
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14766 Clan Chattan
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14766 Clan Chatton St Rollox c1937
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14767 Clan Mackinnon
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14767 Clan Mackinnon St Rollox May 1935
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14768 Clan Mackenzie Perth 28th July 1926
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14768 Clan Mackenzie Perth
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14769 Clan Cameron
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Highland Railway C.Cumming Clan class 4-6-0 - Railway-Photography
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Neil

 

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



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 Clan Class 6.


Still with LMS on the tender 54767 Clan MacKinnon Forres July 1949



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Highland Railway C.Cumming Clan class 4-6-0 - Railway-Photography
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and at Elgin October 1952


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Highland Railway C.Cumming Clan class 4-6-0 - Railway-Photography
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railway photographs from the last 100 years


Neil