(1) the equipment of signals at a station in each direction, shall be a Home and a Starter.
(2) The equipment of signals in the block section between two block stations may when required have one or more automatic or semi-automatic Stop signals; out of which one may be a modified semi-automatic Stop signal;
(3) In addition, such other fixed signals and boards as may be necessary for the safe working of trains may be provided.
(4) Where under special instructions, when one of the automatic or semi-automatic Stop signal in mid-section between two block stations has been modified to work as modified semi-automatic Stop signal, it shall be provided and worked in accordance with clause (2) of the rule 105.
B - Rules applicable to Single Line 107 Essentials of the Automatic Block System on single line.- (1) where trains on a single line are worked on the Automatic Block System,-
(a) the line shall be provided with continuous track circuiting, axle counters or any other similar approved device;
(b) the direction of the traffic shall be established only after Line Clear has been obtained and the controlling lever or switch or button operated to the required position;
(c) a train shall be started from one block station to the other block station in advance only after the direction of traffic has been established;
(d) line clear shall not be given by a block station unless the line is clear not only upto the first Stop signal but also for an adequate distance of one hundred eighty meters beyond it;
210 THE GAZETTE OF INDIA : EXTRAORDINARY [PART II—SEC. 3(i)]
(e) the line between two adjacent block stations may, where required, be divided into two or more automatic block signalling sections by provision of Stop signals;
(f) after the direction of traffic has been established, movement of trains into, through and out of each automatic block signalling section shall be controlled by the concerned Automatic Stop signal and the said Automatic Stop signal shall not assume ‘OFF’ aspect unless the line is clear upto next automatic Stop signal.
Provided further that where the next Stop signal is a manual Stop signal, the line is clear for an adequate distance not less than one hundred eighty meters beyond it; and
(g) all Stop signals against the direction of traffic shall be at 'ON'.
(2) Where under special instructions, when one of the automatic or semi-automatic Stop signal in mid-section between two block stations has been modified to work as modified semi-automatic Stop signal, it shall be worked in accordance with rule clause (2) of the rule 105 , except that adequate distances referred to therein shall be not less than one hundred eighty meters.