A system of working trains on a Single LineA generally Bi-Directional Line which is the only line that carries Running Movements. More using an Electric TokenAny Single Line Token, Staff or Tablet. More, in
which the SignallerA person responsible for the operation of the Signalling System, to safely control the passage and regulation of trains, usually located in a Signal Box. More gives a releaseThe removal of Locking on a function, for example, the removal of Route Locking or the unlocking of a function such as a Ground Frame. More for each TokenAny Single Line Token, Staff or Tablet. More issued. TokenAny Single Line Token, Staff or Tablet. More
instruments at one or both ends of the section may be operated by the train
crew.