A Signalling SystemA series of electrical, electronic, electro-mechanical units brought together to form a system which controls the safe movement of trains. used on a Single LineA generally Bi-Directional Line which is the only line that carries Running Movements. and employing a single TokenAny Single Line Token, Staff or Tablet.
(Train StaffA particular type of Token.). If the driver does not take the train staffA particular type of Token. through the section, a
written ticket is issued to authorise the movement.