BR Regulations Train Signalling Signalmen's General Instructions 1972
1960 BR WR Regulations Train Signalling & Signalmen’s General Instructions
British Rail LMSR Regulations Train Signalling Signalmen's Instruction 1947 1960
1960 British Railway Regulations Train Signalling Signalmens General Instruction
Railway Book:BR-Regulations for Train Signalling and Signalmens General Duties
BR Regulations for Train Signalling on Double Lines by Track Circuit Block 1964
