LMS 2 and 2A boilered 4-6-0 locomotives

The 2 and 2A boilered 4-6-0 locomotives were a group of express passenger steam locomotives of the London, Midland and Scottish Railway fitted with tapered boilers of types 2 and 2A. The series began in 1935 when William Stanier ordered the experimental high pressure compound 6399 Fury rebuilt with a type 2 boiler, which performed poorly until it was re-tubed and given a double blastpipe. The type 2A boiler design that followed was applied to two Jubilee Class engines, and combined with changes to the steam ports and valve gear it produced locomotives more powerful and economical than either the original Jubilees or the Royal Scots. All 70 Royal Scots and 18 of the 52 Patriots were later converted. In all 91 locomotives were rebuilt, and all were withdrawn between 1961 and 1965.