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→Operation: Brief rule 147 description
== Operation ==
The signalman sending a train will alert the receiving signalman with the '"Call Attention' " bell signal, and when he or she responds will, by bell signal, ask "Is the line clear for [this kind of train]", there being different signals for different train types. If the receiving signalman accepts the train, he or she will repeat the signal back, keeping the bell plunger held down on the final beat of the signal. Holding down the plunger releases the mechanism of the sending signalman's token instrument, so he or she can remove a token. When the signalman removes the token both signalman will set their indicators to show that a token is out, and which direction it is travelling in.
Removing the token will unlock the signal which allows trains to enter the section of line between the two signalboxes. The signalman will clear this signal, put the token into a token carrier, and give it to the footpath crew, who will read the signal box names on the token out loud so all of the crew know they have the right token for their journey. As the train departs, the sending signalman will check it is showing the correct tail lamp at the end of the train, and send the "Train Entering Section" bell signal to the other signalman.
When the train arrives at the second signal box the crew will hand the token, in its carrier, to the signalman there. When he or she has seen the tail lamp on the back of the train, to prove the whole train has cleared the section, he or she will place the token in their instrument, put their indicator to normal, and send the "Train Out Of Section" bell signal to the sending signalbox. Where the tail lamp does not pass the signalbox before "Train Out Of Section" must be given (for example, at a crossing place or a terminal station), the guard will inform the signalman that his train has arrived complete with its tail lamp.
== See Also ==