British Railway Regulations for Train Signalling on Double Lines by The Track Circuit Block System Supplement No.3 1964, 20 pages.
British Railway Regulations for Train Signalling and Signalmen's General 1972
British Railways Regulations for Train Examiners, Greasers and Oilers book 1947
1962 British Railways Regulations for the guidance of Train Examiners & Oilers
British Railways Regulations for Train Signalling Signalmen's Instuctions 1960
1960 British Railway Regulations Train Signalling Signalmens General Instruction
