Brakes. Three definitive 1954/1955 books by C.M. Drennan, all published by Simon-Bordman, Ny, viz: 'ABCs of Air Brakes', 'Car Air Brakes', 'Locomotive Air Brakes'. Also: the Air Brake Association: 'Engineering and design of Railway Brake Systems', 1975, Chicago. Some minor scuffing on some dust jackets but still goood condition. (4)