Changes

If signalman Signalman A wishing to send a train will send the "Call Attention" bell signal. When signalman B at the other end of the section acknowledges the "Call Attention" bell signal , signalman A will send "Is the line clear for (the particular type of train)" ''n.b. there are different signals for different train types''. If the signalman B accepts the train they will respond by repeating the bell code but keep the bell plunger held in on the final beat of the signal. Keeping the plunger held in releases the mechanism of signalman A's token instrument, if no other token is presently withdrawn from either instrument, so the signalman can remove a token. When signalman A withdraws the token from the instrument both signalmen will set their indicators to show that a token is out, and in which direction the train is travelingtravelling.

When the train arrives at the far end of the section the crew will hand the token, in its carrier, to signalman B. When signalman B has seen the tail lamp on the back of the train or the guard has confirmed the train has arrived complete , signalman B will place the token in their instrument, put their indicator to normal, and send "Train Out Of Section" to the signalman A.