Locomotive test report, London Midland & Scottish Railway Report No. 37, locomotive class Royal Scot 4-6-0 No. 6165, performance and efficiency: to determine the effect of bogie side control springs on the riding of the engine, May 1932, Derby, 4 pages of text, 3 photographs, 6 diagrams, 1 table. (NRM Technical Archive reference TEST/LMS/20)