His lower indicator on the block indicator to A repeats the position of the commutator.
2.
The switch-hook would both mechanically prevent the plunger being depressed, and electrically prevent the block indicator at Pouparts Junction from showing " Line Clear ".
3.
This caused the block indicator at Pouparts Junction to return to " Line Clear ", as it was not being held on by the switch-hook circuit.
4.
When the train has reached C, the signalman there sends " Train Out Of Section " on the block bell and when B acknowledges it, C places the block indicator to " Normal ".
5.
Let us consider the process of signalling a train in the up direction ( from A to C ) past a signal box B . The signal box in rear is A and the signal box in advance is C . The block indicators at B are in the Normal position.
6.
B immediately offers the train on to C by sending the " Is Line Clear ? " bell signal; if C accepts it he repeats the bell signal and places his block indicator to " Line Clear ", which moves the position of the upper needle indicator in B's block instrument to repeat that indication.
7.
As the train passes, he restores his signals to danger, and when the whole of the train passes B complete with tail lamp attached, B sends the " Train Out Of Section " bell signal ( 2-1 ) to A and when A acknowledges it, he places his block indicator to " Normal ".
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