FORTY YEARS OF CALEDONIAN LOCOMOTIVES 1882 - 1922 ~ H.J. Campbell Cornwell.
Forty Years Of Steam 1926 - 1966 A. W. Flowers Hardback 1st 1969
Forty Years of London & North Western Railway Society Richard Foster 2013
Ian Allan: Forty Years Of Steam 1926 - 1966. A W Flowers Hardback 1st Edition
Forty Years of Stock Car Racing: The Super Speedway Boom, 1959-1964 hardcover LN
Caledonian Railway diagrams and numbers of company locomotives feb 2000
Fifty Glorious Years - Celebrating 50 years of BR Class 50 Locomotives
