CHAPTER VIII: System of Working

CHAPTER VIII
SYSTEMS OF WORKING

56. Continuous Automatic Train Control System –– (1) The Continuous Automatic Train Control system of working shall be adopted on the Metro Railway, for movement of trains between stations and between depot and the main line.
(2) The Continuous Automatic Train Control system works on the principle of target speed and target distance with Cab Signaling by means of continuous transmission between trackside and train through suitable approved means, ensuring safe movement of all trains under all operating conditions by continuously generating a safe operating envelope def ined by the limit of movement authority and the maximum safe speed.
(3) The limit of movement authority shall be the farthest point to which the train may safely proceed taking into account margins for error in speed and distance measurement, calculating braking distances and the equipment reaction times.
(4) The maximum safe speed shall be maximum speed at which the train is permitted to travel without intervention by the train control and signaling system and it shall be continuously calculated in such a manner that permanent speed restrictions, the speed limits for the type of train and temporary speed restrictions shall not be exceeded and the train shall always stop without passing the limit of movement authority.
(5) The Continuous Automatic Train Control system will provide the following modes of train operation, namely:––
(a) Automatic Mode, where provided;
(b) Automatic Reversal Mode (if provided);
(c) Coded Manual Mode
(d) Restricted Manual Mode;
(e) Cut Out Mode; and
(f) Run On Sight Mode, where provided
57. Automatic Mode –– (1) In the Automatic Mode, the train shall operate without intervention by the Train Operator except closing of train doors and starting from a station stop and it shall operate under the supervision and control of Automatic Train Protection functions.
(2) In Automatic Mode, the train control and the signaling system shall––
(a) accelerate and decelerate the train by applying traction power, coasting and applying and releasing brakes;
(b) automatically control speed, acceleration, and stop the train at stations;
(c) provide all indications necessary to operate the train;
(d) determine continuously the maximum safe speed and limit of movement authority;
(e) prevent movement of the train in excess of the maximum safe speed and limit of movement authority
(f) open train doors on the correct side when the train is docked if permitted by the Automatic Train Protection door release and the platform screen doors, where provided, open automatically on the correct side;
(g) prevent the train from starting if train doors, or the platform screen doors where provided, are not detected closed;
(h) train re-starting from a signal stop shall be automatic; and
(i) train starting or re-starting from a station stop shall be initiated by the Train Operator.
58. Automatic Reversal Mode –– (1) This mode, where provided, is used to reverse the running direction of a train automatically in areas of the section specifically defined in the special instructions which are possible only at specified track circuits of a station when train is at standstill.
(2) The transition from Automatic Mode or Coded Manual mode to Automatic Reversal mode is initiated automatically upon receiving the request for reversal operation from Automatic Train Supervision and has to be acknowledged by the Train Operator by pressing the Automatic Reversal button at standstill.
(3) The on-board Automatic Train Protection unit of leading cab activates the unit at trailing end on arrival at a station if a reversal operation is requested by Train Operator.
(4) The train borne Automatic Train Protection unit shall return from Automatic Reversal mode to Coded Manual mode once the reversal operation has been carried out successfully and the Train Operator has unlocked the new leading cab for further running.
59. Coded Manual Mode –– (1) In Coded Manual Mode the train shall be driven by the Train Operator, obeying Cab Signals.
(2) In Coded Manual Mode, the train control and signaling system shall-
(a) provide cab signals and all other indications necessary to operate the train including current speed;
(b) determine continuously the target speed and limit of movement authority;
(c) prevent train operation in excess of the target speed or limit of movement authority;
(d) provide audible and visual warning if the train speed exceeds the target speed or the maximum safe speed;
(e) enable train doors when the train is docked, enabling only the doors on the platform side of the train; and
(f) prevent the train from starting if train doors, or the platform screen doors where provided, are not detected closed.
60. Restricted Manual Mode –– (1) The Restricted Manual Mode is the default mode of operation and is automatically initiated, when the automatic train control train borne equipment is first powered and it remains in operation until sufficient conditions have been met to allow for a transfer to Coded Manual Mode.
(2) The Restricted Manual Mode shall be used-
(a) to operate trains in depots;
(b) following an emergency brake application on main line, and absence of cab signals;
(c) for entry to and up to exit from the depot; and
(d) on instructions from Traffic Controller.
(3) In Restricted Manual Mode, the train speed shall be limited to a maximum of twenty five kilometer per hour enforced by on board Automatic Train Protection equipment.
(4) All platform screen doors, where provided, will have to be operated manually by the Train Operator from the local panel provided near the train cab at the platform.
(5) The Train doors on the correct side will also have to be operated manually by the Train Operator.
61. Cut Out Mode –– (1) The “Cut Out” Mode, is intended for use in case of complete failure of train borne signaling and train control system and in such mode the train speed shall be restricted to twenty five kilometer per hour, unless special provision is made as under-
(i) Low Speed Cut Out Mode –– this is the default mode of operation in Automatic Train Control Cut-out condition, in which the propulsion system would cut out traction of the train above twenty five kilometer per hour speed and the Train Operator shall manually drive the train in accordance with the line-side signals and shall monitor and limit the speed of the train if it exceeds twenty five kilometer per hour speed, by service brake or emergency brake application.
(ii) High Speed Cut Out Mode –– this mode, where provided, shall be employed only under specific instructions from the Operations Control Centre, in which the operation in Automatic Train Control Cut-Out condition the propulsion system would cut out traction of the train above forty kilometer per hour and. the Train Operator shall manually drive the train in accordance with the line-side signals and shall monitor and limit the speed of the train if it exceeds forty kilometer per hour, by service brake or emergency brake application.
(2) In Cut Out modes, the train shall be operated by the Train Operator in accordance with line side signals and on Radio verbal instructions from the Traffic Controller.
(3) Running of trains on mainline in Cut Out Mode is permitted only under instructions of the Traffic Controller.
(4) All platform screen doors, where provided, shall have to be operated manually by the Train Operator from the local panel provided near the train cab at the platform.
(5) The train doors on the correct side shall also have to be operated manually by the Train Operator.
62. Run on Sight Mode –– In Run on Sight Mode, which only operates in the absence of Automatic Train Protection signals from the track, the train is driven manually on line of sight and the speed is limited by Automatic Train Protection system to a maximum of twenty five kilometer per hour. When Automatic Train Protection signals from track are received, this mode automatically changes to Coded Manual Mode.