Highland Railway
What was the operator of Highland Railway Clan Class between Apr 1920 and Oct 1921?
Highland Railway Clan Class The Highland Railways 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 . Dimensions . They had cylinders outside with outside Walschaerts valve gear , driving wheels and a boiler pressured to . Weight was for the locomotive and for the tender . Piston valve diameter is given as ( 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 , plus for the Robinson type superheater , and grate area as . 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 .