* “Accident” means any occurrence which causes or has the potential to cause death or injury to staff, passengers or other persons or cause damage to the property of the Metro Railway, passengers or other persons.

* “Act” means the Metro Railways (Operation and Maintenance) Act, 2002, (60 of 2002).

* “Adequate distance” means the distance sufficient to ensure safety.

* “Approach lighting” means an arrangement in which the lighting of signals is controlled automatically by the approach of a train.

* “Approved special instructions” means special instructions approved 2 by the Commissioner.

* “Authorised Officer” means an officer of the Metro Railway administration who is duly empowered by general or special order of the Metro Railwa y administration, either by name or by virtue of his office, to issue instructions.

* ”Authorised Electrical Person” means any person who is duly authorised by an officer of the Metro Railway administration empowered for this purpose , either by name or by designation, to perform specific work on the electrical equipment or circuitry.

* “authorised employee” means a Metro Railway employee to whom a competency certificate has been issued by the metro Railway Administration.

* “authority to Proceed” means the authority given to the Operator of a train, under the system of working, to enter the block section with his train.

* “Automatic Fare Collection system” means an automatic system for collection of fares and issuing of tickets;
* “Automatic Mode” means the mode of operation of train under Automatic Train Operation where train is driven automatically including control of acceleration, coasting, braking and stopping of trains.

* “Automatic Train Operation” means a sub-system of Continuous Automatic Train Control system, which automatically controls acceleration, coasting, braking and stopping of trains.
* “Automatic Train Protection” means a sub-system of Continuous Automatic Train Control System which maintains safe train operation, including train direction, train separation, interlocking and speed enforcement.

* “Automatic Train Supervision” means a sub-system of Continuous Automatic Train Control system which automatically monitors the entire system and directs train running so as to provide scheduled service under normal circumstances.
* “Auxiliary Systems Controller” means a metro railway employee competent and responsible for the control of the Auxiliary systems including tunnel ventilation system, station air conditioning and building management system of the Metro Railway.

* “Axle Counter” means an electrical device which, when provided at two given points on the track, proves, by counting ‘axles in’ and counting ‘axles out’, whether the section of the track between 3 the said two points is clear or occupied.

* “Baggage Handling System” means a mechanised train borne and station-based system meant for transfer of passenger’s baggage between stations and to the Airport terminal.

* “Berth” means length of track nominated to be occupied by a train adjacent to a platform or in the Depot.

* “Block section” means the portion of the running line, as specified by special instructions, on to which no running train may enter, until permission to approach has been received.

* “Blue Light Station” means a location indicated by a blue light where a person can communicate with the Operations Control Center and disconnect traction power of a specified section to stop a train, in an emergency.

* “Building Management System” means a control-panel or workstation installed at every station to monitor and control proper functioning of building services, including safety critical systems.

* “Cab Signal” means visual indication displayed as speed limit and target distance on the train operator’s console granting him the authority to proceed under Automatic Mode, or Coded Manual Mode of driving.

* “Calendar Day” means the period from midnight to midnight.

* “Car Shed” or “Service Depot’ means an area where the Metro Railway trains and coaches are berthed either for repair or for any other attention including stabling.

* Caution Order” means an instruction given to the Train Operator to observe special precautions including speed reduction at notified locations.

* “Certificate of Competency” means the certificate issued to the Metro R a i l w a y employee after he has been examined for his knowledge of rules, regulations, procedures and manuals relevant to his duties, and found fit.

* “Chief Controller” means the metro railway employee in overall charge of Operations Control Centre functions.

* “Coded Manual Mode” means the mode of operation of train under Continuous Automatic Train Control System where train is driven manually but remains subject to maximum speed determined by Automatic Train Protection codes.

* “Commissioner” means the Commissioner of Metro Railway Safety appointed under section 7 of the Act.