
Regulations for Train Signalling by the Permissive Block System
LNER instruction booklet for Southern Area Western Section, "Regulations for Train Signalling by the Permissive Block System," issued 1 July 1934. 9pp.
LNER instruction booklet for Southern Area Western Section, "Regulations for Train Signalling by the Permissive Block System," issued 1 July 1934. 9pp.