Section 105 in The Dedicated Freight Corridor Railway General Rules, 2018
105. Essentials of the Automatic Block System on double line.
(1)Where trains on a double line are worked on the Automatic Block System ,-(a)the line shall be provided with continuous track circuiting, axle counters or any other similar device approved by the competent authority appointed by Dedicated Freight Corridor Railway in this behalf;(b)the line between two adjacent block stations may, when required, be divided into a series of automatic block signalling sections, each of which is the portion of the running line between two consecutive Stop signals, and the entry into each of which is governed by a Stop signal; and(c)the track circuits or axle counters or any other similar approved device shall so control the Stop signal governing the entry into an automatic block signalling section that, -(i)the signal shall not assume an 'OFF' aspect unless the line is clear not only up to the next Stop signal in advance but also for an adequate distance of not less than one hundred twenty meters; and(ii)the signal is automatically placed to 'ON' as soon as it is passed by the train.(2)(a)under special instructions, one of the automatic or semi-automatic Stop signal between two stations in each direction may be made to work as modified semiautomatic signal;(b)the mid-section modified semi-automatic Stop signal so provided shall be interlocked with the Home signal of the station ahead and the advance starter of station in rear through track circuits or axle counters or both and shall be controlled by the Station Master of the station ahead, and the relevant indications whether the signal is in normal automatic mode or modified semi-automatic mode shall be available to the Station Masters at both ends;(c)advanced starter signal of the station in rear shall be interlocked with the midsection modified semi-automatic signal in such a way that when working with 'A' marker extinguished, the advanced starter shall assume 'OFF' aspect automatically or taken 'off' only when the line is clear upto a distance of not less than one hundred twenty meters beyond the mid-section modified semi-automatic Stop signal;Similarly the mid-section modified semi-automatic Stop signal when working with 'A' marker extinguished shall assume 'OFF' aspect automatically or be taken 'off' only when the line is clear upto an adequate distance of not less than one hundred twenty meters beyond the Home signal of station ahead.Provided further that the mid-section modified semi-automatic Stop signal in 'OFF' condition shall depict the aspect green or double yellow based on the aspect and number of automatic signal (including any other signal) between this signal and the Home signal of the receiving station.(d)(i)during abnormal conditions like fog, bad weather impairing visibility, the midsection modified semi-automatic Stop signal may be worked by extinguishing 'A' marker which shall also ensure that the 'A' marker of the advanced starter signal on the station in rear and home signal of station in advance shall also be extinguished;(ii)when the modified system is to be introduced, the Station Master of the train despatching station shall talk to the Station Master of the receiving station giving his private number; concurrently the Station Master of the receiving station shall operate the corresponding switch or button and exchange his private number with the Station Master of the despatching station;By this action of both the Station Masters, the "A" Marker of advanced starter of the dispatching station, the mid-section modified semi-automatic Stop signal and Home signal of receiving station, all shall be extinguished for that direction. The train working shall start under the new modified system in the direction for which the switch or button was operated. The relevant indications provided on the panels of both the stations shall change to depict that the signal is now working in modified semi-automatic mode. Similar action shall then be followed for the other direction;(iii)at the time of introducing the modified automatic signalling system of working, the Station Master controlling the mid-section modified semiautomatic Stop signal should, as far as possible, take care that the aspect of this signal is 'ON' to avoid sudden braking by the Loco pilot of an approaching train, if any. In addition, the Home signal of the controlling station, be put in manual mode before introducing the changeover;(iv)after the introduction of modified system, the advanced starter shall not assume 'off' aspect unless the last train between the advanced starter and the modified semi-automatic Stop signal, which had already gone past the advanced starter prior to switching over, has cleared the line upto one hundred twenty meters beyond the modified semi-automatic signal in mid-section; andSimilarly, the modified semi-automatic signal, shall not assume 'off' aspect unless the last train between the modified semi-automatic Stop signal in mid-section and the Home signal, which had already gone past the modified semi-automatic Stop signal prior to switching over, has cleared the line upto one meters beyond the Home signal.Further, the interlocking will be such that the process of taking 'off' advanced starter signal and mid-section modified semi-automatic Stop signal need not be repeated for every train and between the two block stations, not more than two trains, one on either side of the modified Stop signal will be ensured by the signalling system between two section at any given direction at any given point of time.(v)also during the time modified system is enforced, the Home signal of the receiving station shall continue to work in manual mode only;(e)during normal condition, mid-section modified semi-automatic Stop signal shall work as normal automatic Stop signal with "A" marker lit;(f)it may so happen that a Loco pilot encounters a situation when the 'A' Marker gets extinguished and the aspect of the modified semi-automatic signal turns on while he is approaching on account of change over. In such a situation, the Loco pilot shall stop his train short of and proceed only in accordance with clause (k) below;(g)the change over from normal automatic signalling to modified automatic signalling shall take place at a prefixed nominated time as notified by the authorised officer;(h)change over from modified automatic signalling to normal automatic signalling shall also take place at a prefixed nominated time as notified by the authorised officer;(i)the normal system shall be reintroduced by operating the switch or button provided for the purpose under exchange of private number which will re-store the 'A' Marker on mid-section modified semi-automatic Stop signal to lit condition. The condition of 'A' Marker of Home and Advanced Starter signal shall continue to be determined by the controlling Station Master based on the local conditions;(j)even with the change in the signalling arrangement other automatic signal in the section shall work normally and Loco pilot shall follow the existing rules while passing these; and,(k)the Loco pilot on finding a modified semi-automatic Stop signal in mid-section with 'A' marker extinguished in 'ON' condition, he shall not take his train beyond the said signal unless he receives an authority conveyed or transmitted on secured means of communication by Station Master on duty of the station ahead in accordance with special instructions, orIn case, he is unable to contact the Station Master of block station in advance, he shall pass the signal at 'ON' after waiting for five minutes at the signal, proceed cautiously and be prepared to stop short of any obstruction, at a speed not exceeding ten kilometre per hour upto the next automatic signal and act as per aspect of that signal.Provided further that where position of the trains in front can be verified through Train Monitoring System, the Controller can also authorise the Loco pilot to proceed upto the Home signal.(3)in case of double line the last Stop signal shall not be taken `OFF' for a train unless the line is clear upto an adequate distance of one hundred twenty meters beyond the next Automatic Stop signal, or when the next Stop signal is a manual or semi-automatic Stop signal for an adequate distance of not less than one hundred eighty meters beyond it.
