7 1/2" x 5 ".   softcover, original - two-cycle Diesel locomotive Engines Part i ed. 1-1949, operation of diesel freight Locomotives Edition 1,1947, diesel locomotive auxiliaries' part 2 ed.1 1950, electrical equipment of diesel locomotives part 1 ed. 1-1949. and the same title part 3 ed.1, 1949 and same title part 4 ed.1 and operation of diesel passenger locomotives edition 1. prepared especially for home study.