Bibliography & Dictionaries
Aberdeen Public Library
World Railways - A Catalogue of Railway Exhibits Displayed at Airyhall Branch Library & Checklist of Books and Maps 
Booklet prepared in connection with exhibition of world railways organised by Aberdeen Public Libraries in 1970. Includes separate catalogue of artefacts, documents, photographs, posters and drawings.
Encyclopaedia of British Railway Companies
Invaluable reference work listing all railway companies with brief details of their history. Four chapters deal with each Big Four group constituent and a final chapter covers independents and other companies. Includes time charts for amalgamations.