| 3. - The Danger Signal must always be kept exhibited at
all the Fixed Signals at Tablet Stations, except when it is necessary to
lower or turn them off for a train to pass; then before any Signal is lowered
or turned off, care must be taken to ascertain that the Line on which the
train to be signalled forward is about to run is clear and properly protected.
When trains which have to cross each other are approaching a Tablet Station in opposite directions, and the signals have been lowered for one train, they must not be lowered for the other train until the first train has come to a dead stop, and the Signalman has seen that the Line on which the other train will arrive is quite clear.
No Signalman must permit any train to foul the crossings, or to be drawn or propelled on to the Single Line for shunting purposes, after permission has been given in accordance with clause 6 for a train to enter the section at the other end.
REPETITION AND ACKNOWLEDGEMENT OF SIGNALS.
|4. - All signals must be acknowledged by repeating them, except as provided in clauses 7, 8, 19, and 28, and no signal must be considered as understood until it has been correctly repeated to to the Tablet Station from which it was received. When the Is Line Clear? signal is not promptly acknowledged, it must be given again at short intervals. All other signals must be repeated until correctly acknowledged.|
MODE OF WORKING TABLET INSTRUMENT
|5. - When the Tablet Instruments are not in use the word "IN" is shown on the white ground of both disks. The slide must not be withdrawn until it has been pushed well home, and the locking magnet has given a click. When a Tablet has been received from a Driver, the slide must be pulled out to its full extent and the tablet placed therein face downwards, then be pushed in slowly. The slide whilst being withdrawn or pushed in disconnects for a short time the line circuit, and causes the galvanometer needle to fall to zero, and in order that the Signalman at the opposite end of the section may observe the movement of the galvanometer needle, it is necessary that the slide should be withdrawn and pushed in slowly. All movements must be made slowly and distinctly.|
ILLUSTRATION OF THE MODE OF SIGNALLING BY TRAIN TABLET
| 6. - For the purpose of illustrating the course to be adopted,
A and B are supposed to represent two Tablet Stations, and the process of
signalling a train is as follows:- On the approach of a train to A, the Signalmen
there will give to B the proper Is Line Clear? signal. The Signalman at B,
after having ascertained that the line is clear for the train to run upon,
must repeat the signal, holding down his bell plunger on the last beat until
he sees his galvanometer needle fall to zero; this shows the Signalman that
A has duly received his signal, and has withdrawn his slide with a Tablet.
The Signalman at A will then replace his slide, giving 1 beat on the bell
plunger to B, which will indicate that the Tablet is out, and hand the Tablet
to the Engine Driver; after this has been done, give Train entering Section
signal. Upon arrival of the train at B, the Signalman will pull over his
switch, withdraw the slide, insert the Tablet, replace the switch, push the
slide home, which gives one beat; then he must give two beats on the plunger.
A will then give the acknowledgement signal of 3 beats on the plunger. The
upper disk, when showing the signal "IN", indicates that the section is "Clear;"
when showing the Signal "OUT," that permission has been given to the Signalman
at the distant end of the section for him to withdraw a Tablet, and that
a Tablet has been withdraw accordingly, say, for a "Down train."
The lower disk indicates that permission has been received, and that a Tablet has been withdrawn at the Home Station, say, for an "Up train."
The bell plunger serves to transmit all signals on the bell or gong, as per code.
Except as provided in clause 36, the Signalman is the only person authorised to take a Tablet from, or deposit a tablet in, the Tablet Instrument, and the number of the Tablet carried by each train must be entered in the Train Record Book.
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