Maintenance of sign and communication systems in railways and subways

Maintaining signage and communication systems on railways and subways is one of the tasks of rail transport companies.

In the past, this was done by needlemen. But over time, with the advent of railroads, signaling systems became electric.

Types of symptom control systems
Electrical signaling systems are divided into the following structures:

LOCAL CONTROL (L. C):
It is possible to control all the equipment located in the station from one place and panel.

REMOTE CONTROL Remote Control System (R. C):
Ability to control two or more stations from one place with remote control systems in which a control center has the ability to remotely control traffic up to 4 stations. These stations can be on one side of the station or on either side of the station.

ENTERIALIZED TRAFIC CONTROL (C. T. C):
This system consists of a control center and a number of affiliated stations in each section, and the control center can control the signs, needles and barriers of each of its affiliated stations. In this system, a control center has the ability to control traffic of 40 stations and more.

Automatic Train Control (ATC) intelligent control system:
It is a system that automatically controls the speed of trains according to the relevant signal and by receiving information from the equipment along the line.