Highland Railway Clan Class

The Highland Railway's Clan Class was a class of passenger 4-6-0 steam locomotives designed by Christopher C. The design is derived from that of the slightly earlier Clan Goods Class, although the similarity is more visual than real. The first four were built in 1919, and the remaining four in 1921.
==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 #53 "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HR Number	Name 	Built	LMS Number	BR number	Withdrawn 	Notes
49 	Clan Campbell 	1919 	14762 	— 	June 1947 	
51 	Clan Fraser 	1919 	14763 	— 	August 1944 	
52 	Clan Munro 	1919 	14764 	54764 	February 1948	BR number not applied
53 	Clan Stewart 	1919 	14765 	— 	February 1945	
54 	Clan Chattan 	1921 	14766 	— 	April 1944 	
55 	Clan Mackinnon	1921 	14767 	54767 	January 1950 	
56 	Clan Mackenzie	1921 	14768 	— 	March 1945 	
57 	Clan Cameron 	1921 	14769 	— 	November 1943	
==Gallery==
File:Cba9bedbf4f7eff27bc933b41cc13c8c--british-rail-steam-locomotive.jpg
File:E62cc6d700a6e0dea932deb5c098dc86.jpg
Category:Highland Railway Locomotives
Category:Highland Railway
Category:Steam locomotives
Category:4-6-0 steam locomotives
Category:4-6-0 locomotives
Category:Scrapped locomotives
Category:Locomotives
Category:Passenger locomotives
Category:Built in 1921
Category:Hawthorn Leslie Locomotives
Category:Built in 1919
Category:Standard gauge locomotives
Category:Scrapped steam locomotives
Category:Tender locomotives
Category:Standard gauge steam locomotives of Great Britain