Outline
Signal equipment is to control an operative path, speed, stop at a fixed position, stopping time, operative distance among trains and so on.As it is considerably important equipment for the safe operation of a train, it has a dual installation to minimize a possible failure.
In the case of a break down, it operates in a fail-safe side. When a train used to run at a low speed and its service frequency was light in early days, the initial signal device was just for a safe operation, but as an electric and electronic technologies are introduced into the signal equipment, it not only functions as a safe operation, but also contributes to the increase of effective operation such as a high-speed, high-density and automatic running.
Composition of signal equipment
Signal equipment composition
The Outline of Signal Equipments
Total Traffic Control (TTC)
Total Traffic Control For Operation
With an indicator panel showing a present operation status of the trains in all sections and direct-controlling unit for an operator to work in an operation state, it executes an intensive monitor and a running control for safe operation.
Signal Control Equipment
As a total system to control the operation state of a train, it is composed of main computer and information-transmitting unit. The main computer analyzes an automatic course, returning, stopping time to have control of a field equipment necessary for an automatic operation. And the information-transmitting unit transmits data between total traffic control and field facility.
Total Traffic Control (TTC)
Interlocking equipment
Track circuit
Track circuit is to sense a present position of a train, which configures an electric circuit on track and sends out operative information to a train with the use of this electric circuit.
Automatic operation sub-system
It is to control a stopping fixed-position and stopping time signal of a train
through a mutual communication
between a conductor and TTC unit.
Operator's cab
As an equipment to control a train in partial section of working sections, it performs the same function as Total Traffic Control. In the case that TTC has a failure or if necessary, an operator can monitor an operative state of a train and control it.
Electric switch
Signalling equipment
It receives an operative condition from interlocking equipment and
sends out a signal for an conductor
to be able to confirm it visually.
In the case of a poor operative
condition, red light is on to prevent
a train from entering into a platform.
Fixed position stop equipment
it is installed in railway line to transmit information
to a coming train.
Starting time signal
Starting time signal is on 6 seconds before leaving a track and off 3.5 seconds before starting a train
Train wayside communication
transmitting information of a starting train (train number, destination)
to a ground facility such as TTC and interlocking equipment
System supervision console
SSC indicates an operation state of each equipment such as the specification of unit failure and alarm signal,
and a running state of trains.
