Original folder containing hand-written notes and calculations with annotation 'Technical data on various locomotives' and on the back cover 'Data useful when designing locomotives'. Contains a Rhodesia Railways drawing of power reverse gear (1952); hand-written notes and calculations of boilers and steam power etc. of various locomotives including London & North Western Railway (LNWR), London Midland & Scottish Railway (LMS), London & North Eastern Railway (LNER) and Pacific class locomotives, some written on the back of China Ministry of Railways documents from early 1930s; brochure and calculations on South African Railways 4-8-2 locomotives built by North British Locomotive Co.; Peking-Mukden Railway locomotives; LNER 10,000; Jodphur Railway locomotives; LMS Coronation Scot; Canton Kowloon Railway locomotives 4-6-0 and 2-6-0; Ping Sui Railway Mikado and Pacific locomotives; P.N.L. [?] 2-8-2 and 4-6-2 locomotives; 2-5-0 M.M. [?] engines.