A system of working trains on a Single LineA generally Bi-Directional Line which is the only line that carries Running Movements. More with the driver or other
authorised person responsible for operating the TokenAny Single Line Token, Staff or Tablet. More instruments at one
or more locations remote from the Signal BoxThe building in which the Signaller(s) is/are situated together with the control and indication system for the signalling. See also Signalling Centre. More, after obtaining verbal
permission from 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.