Train Control System

 Train control is the process by which the movement of rail rapid transit vehicles is regulated for the purposes of safety and efficiency. The process is carried out by a combination of elements-some men, some machines—located on the train, along the track, in stations, and at remote control facilities.

The system consists of two modes of operation:

-Normal Mode: The trainee performs generic operations of train control system.

-Fault Mode: The trainee performs troubleshooting and fault finding operations and initiates remedial action on the faults.

These elements interact to form a command and control system with four major functions:  
Train Protection: this involves prevention of collisions and derailments.
Train Operation:  this involves control of train movement and stopping at stations,
Train Supervision: this involves supervising display and record keeping of the vehicle functions.
Train Communication: interchange of information among the elements of the system.
The train control system may sense train speed, determine that it should be increased, provide an appropriate command signal to the motors, and monitor to see that the desired result is achieved.  The means, by which a speed change is effected, however, are not part of the train control system. All the equipment for getting electric power to the wayside, bringing it into the train, converting it to mechanical energy, and providing tractive effort is external to the train control system.