the summary of signalling facility

The signalling facility is the one to control the train operation, and it is a very important facility to secure the safety of the train by controlling the operation direction, operation speed, stoping a train at the normal position, the time to stop train, and the operation distance between two cars. It is dual system, thus, it minimizes the failure and as it operates into the safe side when it is out of order, it guarantees the safety of the train. When trains travelled very rarely and at slow speed in the early stage of the train, the signalling device was built only for the purpose of safety. But, as the electric and electronic techniques have been induced to the signalling, the signalling device is not only the facility to secure the safety but also contributes to the efficiency increase of the operation by the high speed, high density and auto operation of the train etc.

what consists of signalling facility

functions according to each main facility

control facility

TTC(Total Traffic Control) is the important facility needed for safe operation of urban rail and it consists of operation control room and signalling control room.

operation control room

It consists of train operation status display to show operation condition of every train to run in the whole section and the facility an operator can control the train operation condition directly. Therefore, it performs intensive monitoring and proper operation handling needed for the safe train operation directly.

signalling control room

It is the facility to handle the general condition of train operation. It consists of train operation control computing device to control the field facility needed for automatic operation of the train directly by analysing auto course, turning train, and the time to stop etc. by the train time table in the most rational way and information sending and receiving device which sends and receives the information between the control center and the field facilities.

field facility

Interlocking System

It is the device to control nearby signalling facilities(track circuit, switch point, signalling device etc.) automatically by recognizing control command of control facility, the demands of the operator and the train movement etc.

Track Circuit

It is the facility to detect the current location of the train. It detects the train by comprising the electrical circuit on the rail road and it sends the information needed for operation to a train using the electrical circuit.

ATOS : Automatic Operation Sub-system

It is the facility related to the automatic operation of a train. It sends the received information from the train by communicating with the train to TTC device and control the stopping time guide lamp and stopping at the normal position lamp.

operation handling room

It is the facility to control trains of some sections during the train operation and it has the same functions as the operation control room. It is the device to monitor and control the train operation condition when an operator needs it or when the control room is out of order.

switch point

It is the device to change the direction of the rail line when it is needed to change the operation direction of a train. It includes the safety device to make it not move until a train passes after being switched.

signalling device

It is the device to inform the driver of whether train operation is available or not. It shows the signals for a driver to confirm them with naked eyes after receiving the operation conditions from the interlocking device and when operation conditions are not proper enough at the moment, it turns on the red lamp for a train not to enter.

normal position stoping device

It is the facility aimed to stop the train at the normal position automatically when the train enters the platform. It is the device to stop the train at the normal position accurately by sending the information to a train as it is installed on the rail line.

stopping time informing lamp

It is the device to inform the driver of the time for a train to leave the platform. It turns on 6 seconds before leaving and it turns off 3.5 seconds before leaving, thus, it tells the driver the time to leave.

TWC(Train Wayside Communication)

It is installed in the station platform and the device to send the train related information to the ground facility. As it sends the train information such as train number or its route etc. to TTC device and the interlocking device, it can control the automatic track entering and the time to stop.

SSC(System Supervision Console)

It monitors the movement condition of the field facility. It displays the facility operation conditions such as the breakdown of each device and alarming history etc. and the condition of the train operation.