Section 7 in The Calcutta Metro Railway General Rules, 2000
7. System of working.
- All trains working between stations shall be worked on one of the following systems:-(a)Continuous Automatic Train Control.(b)Absolute Block System.(c)One train only system.7.02Authority to enter the block section. - (1) A driving motorman shall not take his train into the block section unless he has received an authority to proceed as specified under special instructions.(2)Provided that in an emergency the traffic controller may permit a second train to enter the section in accordance with special instructions.A. Continuous Automatic Train Control System7.03Essentials of Continuous Automatic Train Control (CATC) System. - (1) (i) Where train movements are controlled by ATP system, "the line shall be provided with continuous track circuiting.(ii)The line between two adjacent block stations shall be divided into a number of ATP Blocks.(iii)Target speeds for each ATP block transmitted in the form of ATP codes by speed code transmitters at the station to the train are so regulated that trains observing these speeds shall stop on service brakes behind an obstruction (with buffer block clear) and in event off failure of service brakes, emergency brake will be applied to ensure the stoppage of the train clear of obstruction.(iv)"Resetting" of the emergency brakes shall be possible only after the train has come to a complete stop.(v)Before proceed codes can be transmitted to the train in approach of the terminal and provisional terminal block stations,ATP system ensures that all facing points en-route are correctly set and locked and all trailing points including isolation are set.(vi)proceed codes between any two stations will be transmitted only when the said section is set to work in "Auto" mode on Station Master's panel.(vii)ATP working shall be provided only for normal direction of traffic.(2)When driven in "ATO" mode -(i)the accelaration, coasting and braking to stop the trains at the station without overrun are controlled automatically. The driving motorman shall however keep a good lookout to apply emergency brake if situation so warrants.(ii)the conducting motorman shall open and close the coach doors as guided by suitable visual indications activated by platform door loop.(iii)as guided by the departure regulation light, the driving motorman shall start the train by operating "Start" button only when "proceed" code is present on the cab signals.(3)When train is driven in "coded manual" mode, the trains are controlled by cab signals and ATP codes, but are driven manually. The motorman shall be fully responsible for controlling the train speeds according to the target speeds indicated.(4)ATP codes and cab signals are rendered ineffective in the "restricted manual" mode and "off" mode of driving and trains are worked on absolute block system or under special instruction. The motorman shall be fully responsible for the operation and safety of the train duly observing the station signals and block signalling rules.(5)The driving mode shall be changed only when the train has come to a complete stop.(6)Reverse direction of movement shall be done in 'OFF' mode only.(7)When the train movements are controlled by the Automatic Train Supervision (ATS) system,(i)Each of the train put to run in the section will be identified by its rake number, link number and train number either by the Car Shed panel operator or by the Traffic Controller. This identity is carried forward along with the train during its movement in the section and is exhibited on the mimic display panel and the work stations at the OCC.(ii)The mimic display panels and the work stations at OCC also display the status of all the signals and points and other signalling equipment in the entire section.(iii)Time-table pertaining to the day of operation will be loaded into the computer at the OCC in the beginning of the day.(iv)This computer links up the train description with the time-table data and sets the route in the terminal station and the provisional terminal stations according to the link.(v)On approach of the train to the station, command to set the route is sent from the computer to the station signalling system which processes it in accordance with the safety criteria attached to the route setting.(vi)The computer also regulates the dwelling time of the train at each station platform according to the timetable.(vii)The computer also sets the passenger destination indications at each station and announces the arrival of train on each platform in advance.(viii)Traffic Controller may intervene to regulate or route the trains manually when the situation so warrants.(ix)Traffic Controller can also transfer the control of individual station panels to Station Masters to enable local operation when situation so warrants.7.04Duties of Motorman in case of defective ATP/ATO. - (1) Failure of ATP Track Equipment -In the event of failure of ATP Track Equipment in a Section,(i)The train shall come to a stop either by service braking or by emergency braking automatically.(ii)The driving motorman, should report by radio to the Traffic Controller this event duly giving his train number and the location of the train. The Traffic Controller after ascertaining the safety of train running will authorise by radio the movement of the train in the restricted manual mode. The driving motorman shall then continue to the next station in RMM mode and change to ATO or CMM mode as applicable over rest of the line duly informing the Traffic Controller.(iii)In the event of prolonged failure of ATP track equipment in the section, Traffic Controller may decide to introduce Absolute Block working between the two stations on either side of the faulty ATP block.In such a case the Traffic Controller shall transfer the control to the stations on either side.The driving motorman of all following trains shall switch over to the "OFF" mode at the station in rear for train operation between these two stations after obtaining due confirmation from the Traffic Controller.On arrival, at the station in advance, the driving motorman shall change over to ATO or CMM mode as applicable over the rest of the line.(2)Failure of ATP On-Board Equipment -In case of defect in the On-Board ATP Equipment rendering the complete CATC system including RMM mode unworkable, the train may have to be run in the "OFF" mode in which case absolute block working will have to be introduced in the relevant section till the defective train is removed from service.Note: Restoration of normal working after rectification of defect causing abnormal working mentioned in sub-rules (1) (iii) and (2) above shall be done by Traffic Controller on receipt of confirmation from Signal Inspector and when there is no train in block section.(3)Failure of ATO Track Equipment -If the driving motorman notices that while running in ATO mode his train is not stopping at station due to failure of ATO Track Equipment at the station, he shall take prompt action to stop the train at the station by applying service/emergency brake manually. The driving motorman shall suitably arrange to back the train on to the platform in case the train overshoots the stopping position. He shall also arrange to activate the automatic door bypass switch in case it is needed due to failure of the ATO. The driving motorman shall also inform of such failure to the Traffic Controller, who shall instruct all the following trains motormen to approach the affected station in CMM mode and revert back to ATO mode while leaving the affected station, provided the conditions so permit.(4)Failure of ATO On-Board Equipment -In the event of failure of ATO On-Board equipment, the driving motorman whose ATO has become defective will drive the train under CMM mode.7.05Duties of the Traffic Controller in the event of defect of CATC. - (1) On learning from the driver regarding the stoppage of the train due to failure of ATP, the Traffic Controller shall -(i)check any fault alarm for the area concerned by an audiovisual indication as provided in the system in the OCC.(ii)check the occupancy of the track ahead as indicated on the mimic display panel and the work station.(iii)check the position of the preceeding train.(iv)report the details to the person nominated under special instructions for corrective action.(2)If the track ahead is shown to be unoccupied on the mimic display panel or the Work Station and the Traffic Controller is satisfied that there is no apparent reason why the train should not proceed forward, he shall authorise the driving motorman to proceed in Restricted Manual Mode to the next station ahead.After the train has arrived at the station ahead and the driving motorman confirms reverting to the ATO" or "Coded Manual Mode" of driving and display of Proceed" code in the cab, the Traffic Controller may authorise the change of driving mode.(3)If the track ahead is occupied or obstructed, the Traffic Controller shall permit a train to be worked into that occupied section only when necessary to assist a defective train. He shall authorise the driving motorman to proceed with extreme caution in Restricted Manual Mode upto a specific location.(4)In case the cause of the defect of ATP system is likely to continue for considerable time, Traffic Controller shall introduce Absolute Block Working in the relevant block section as follows:-(i)He shall ensure that the earlier train permitted to move on Restricted Manual Mode has fully cleared the block section.(ii)He shall inform the Station Master on either side that absolute block working is to be introduced.(iii)He shall, after the Station Control Panel is arranged to be manned by the Station Master, transmit necessary permission to enable operation of the particular section under "local" control.(iv)He shall contact the driving motorman of the trains and inform them of the particular block section in "OFF" mode/"RMM" mode.(v)He shall authorise the driving motorman to revert to "ATO" or "Coded Manual" mode of driving at the station in advance.(vi)He shall control the other trains in the section if so needed.(5)When the defect of the ATP in section is removed, Traffic Controller shall authorise the Station Masters of the above stations to revert to "Central" working and abandon manning of the Station Master's panel.(6)In case the Traffic Controller becomes aware of a route failure in a terminal or provisional terminal station through alarms or otherwise, he shall -(i)determine as far as possible what part of the route is not correctly set and inform the person nominated under special instructions for further action.(ii)if the failure has occurred while working in "Auto" mode, he shall attempt to set the route manually. If the route is set, the route shall remain in manual selection till the defect is removed.(iii)if the route cannot be set, he shall inform the concerned Station Master and after the Station Master confirms that the local control panel is manned, transmit the permission to enable local control of the interlocked area.(iv)continue to guide the Station Master regarding the route setting as necessary and act as an intermediary between him and the driving motorman as necessary. On rectification of the defect, he shall authorise the Station Master to close down Station Control Panel by transferring the control to "Central".7.06Duties of Station Master in the event of defective CATC. - (1) It may become necessary to suspend "Central" Control and transfer the control to individual station/stations in case of -(i)Failure of data transmission system between Central Control and station.(ii)Inability to operate points and signals from Central Control either automatically by computer or manually by the Traffic Controller.(iii)Delay in rectification of defect of ATP track equipments in any section.(2)The Station Master, upon receiving the instruction from the Traffic Controller to switch to local control, may -(a)come to complete understanding with the Traffic Controller regarding the route to be set and the movement to be carried out;(b)check that the position of the points and signals on his panel coincides with that in OCC;(c)operate the transfer switch to take local control at the Station Master's Panel;(d)attempt to select and set the route as earlier instructed by the Traffic Controller;(e)maintain local control of the area till further instruction from Traffic Controller;(f)if setting of the route from the Control Panel is not possible, take action as laid down in rule 3.45;(g)when failure of ATP track equipments in the section is likely to last for some time or cause service delays, trains will be worked from station to station over the section concerned on absolute block system. For this purpose, it will be necessary for the panels of stations on either side of the affected section to be worked locally and operate the trains as per the provisions contained in rule 7.07, 7.08 and 7.09.B. Absolute Block System7.07Essentials of absolute block system. - (1) Where trains are worked on absolute block system -(a)No train shall be allowed to leave a block station unless permission to approach has been received from the block station in advance; and(b)such permission to approach shall not be given unless the line is clear, not only upto the first stop signal at the block station at which such permission to approach is given, but also for an adequate distance beyond it.(2)Unless otherwise authorised by approved special instructions, the adequate distance referred to in clause (b) of sub-rule (1) shall not be less than 180 metres.(3)Trains will be driven in "off" mode.7.08Conditions for granting permission to approach. - The line shall not be considered clear and permission to approach shall not be granted unless -(a)the whole of the last preceding train has arrived complete and has cleared an adequate distance beyond the first stop signal; as specified in rule 7.07(2) above;(b)all signals have been put back to 'on' behind the said train;(c)the line on which the train is intended to be received is clear of any obstruction upto the starter or, at terminal block stations, upto the place where the train is required to come to a stop; and(d)all facing points have been correctly set and locked for the admission of the said train and all trailing points have been set including isolation.7.09Rules and regulations for single line working on a double line section when one line is obstructed. - In case an accident to a train or track or ether obstruction precludes the use of one of the lines on double line section; the traffic may temporarily be worked over the other single line or over the portion of the obstructed line which is clear of obstruction under the system of "one train only system", subject to the following:(i)The line or the portion of the line is free from all obstructions.(ii)If there is any point ever the line/portion of the line on which the train shall run under "one train only system", the same is set and locked.(iii)The occupants of the affected train have been detrained and none is left inside tunnel.(iv)The affected train is not fouling the other line and the same is properly secured.C. One train only system7.10Essentials of one train only system. - Under the One Train only system, only one train shall be on a section at one and the same time.7.11Conditions for granting permission to approach and making over authority to proceed at block stations. - (a) Permission to approach shall not.be given to a block station in rear, unless the block section between the stations is clear of all obstructions and the line on which the train is to be received is clear upto the place where the train is required to stop.(b)Authority to proceed shall not be handed over at a block station to the driving Motorman, unless permission to approach has been received from the block station in advance.(c)Train will be driven in the "OFF" mode only.7.12Procedure in case of accident or disablement on the "one train only" system. - (1) If a train becomes disabled and requires assistance or if an accident occurs which renders it impossible for the train to proceed, the driving motorman and the conducting motorman shall take action as laid down in rules 4.34 and 6.08.(2)In case of accident, the Traffic Controller and Station Master of adjoining station shall take action as laid down in rule 6.16.(3)In section where train is worked with single motorman, rule 11.11 may be referred.D. General7.13Block back and block forward. - Block back or block forward shall be done only in accordance with the procedure prescribed under special instructions.7.14Authority for shunting in block section. - When permitting shunting in the block section, the Driving Motorman shall be given an authority for shunting in the block section as prescribed under the special instructions.7.15Isolation of siding. - All siding lines must be isolated from the running lines except under approved special instructions.7.16Obstruction at a block station or in the block section after permission to approach has been given. - No obstruction shall be permitted outside the home signal and on the line on which the train is intended to be received after permission to approach has been given.7.17Shunting or obstruction in the block section. - Shunting or obstruction in the block section shall not be permitted unless the block section is clear and is either blocked back or blocked forward in accordance with the special instructions.Chapter - VIII Block Working
