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Signal & Telecom


Role of the Signalling & Telecommunications Department

  • Safety in train operations
  • Punctuality of running of trains
  • Optimum utilization of line capacity
  • Passenger amenities like Public address system,Train arrival departure information,Train indication board,Coach indication board etc.
  • Manufacturing of specified signalling items
  • Providing telecommunication infrastructure for :
    • Safe and efficient operation of trains
    • Administrative voice and data circuits
    • Passenger Reservation System (PRS)
    • Unreserved Ticketing System (UTS)
    • Freight Operation Information System (FOIS)
    • Crew Management System (CMS)
    • Coaching Operating Information System (COIS)
    • Management Information System (MIS)
    • Video Surveillance system (VSS)
    • Free internet thriugh Wi-Fi at stations.
  • Management of Railways Corporate Wide Information System (RAILNET)


  • Principal  Chief Signal and Telecommunication Engineer (PCSTE) is the overall head of the Signal & telecommunication Department.
  • He is further supported by Principal  Chief Signal and Telecommunication Engineer - Projects (PCSTE/Projects) and Chief Signal and Telecommunication Engineer- Construction(CSTE/Con).
  • He is also assisted by Chief Signal Engineers (CSE's), Chief communication Engineer (CCE) and Chief Signal and Telecommunication engineer (Planning) & Chief Signal and telecommunication engineer(Projects) for all Signalling and Telecommunication maintenance, Planning & Project works.
  • Senior Divisional and Telecommunication Engineers (Sr. DSTE's) are the head of the department at divisional level and Dy.Chief Signal and Telecom Engineer for Construction & project works.

Elements of Safety in Train Operation

    Track Circuiting

Track circuiting is a basic safety device used in signalling systems. It monitors occupancy of a section of track and prevents clearance of signal in the event of the track section being occupied by another train. This is a fail-safe device, which in the condition of its failure prevents the signals to be cleared.

     Axle counters

It is another important safety device used for detecting presence of train in a track section. This device counts the number of train axles entering and exiting through a track section and controls the associated signal.

     Block Working

It is an arrangement to control the entry and exit of train in a section called block section between any two adjacent stations. This maintains space interval between two following trains. It provides safety by preventing the second train to be sent into the section between the stations unless and until the previous train has cleared the section.


   Double Line Block Instrument               Single Line Tokenless Block Instrument


Driver to Guard communication


Driver to Guard communication has been provided for running trains usingVHF walkie-talkie sets, for better co-ordination in controlling of the train.


Interlocking is a mechanism to check the route the train is going to traverse before clearing the signal and to prevent the clearing of signal when it is unsafe for the movement. It eliminates human error and ensures safety in train operations. Two types of interlocking arrangements are in vogue depending on the size of the station yard.


Panel Interlocking

Panel interlocking is provided for smaller yards.It is a signalling system, which assures the best standard of safety and eliminates the accidents arising out of human errors.                                                                                                                                                                                                                                                                                                                                                                           


Route Relay Interlocking                        

Route Relay Interlocking is provided at major junctions and yards where large numbers of train movements are required. It is available at four major junctions/yards viz.Vijayawada, Kazipet, Secunderabad & Dornakal stations in South Central Railway.

Safety at Level Crossing Gates

All the level crossing gates in the station area and other important gates in the route are controlled by the signals. These gates are called interlocked gates and provide best safety for the road users. Provision of telephone communication at manned level crossing gates is a safety tool to ensure closure and opening of gates at appropriate time. On this railway all the manned level crossing gates have been provided with telephone communication facility with the controlling stations.


                           L C Gate with                               Emergency Sliding Boom Arrangement

         Electrically Operated Lifting Barrier                       at Level Crossing Gate                    


Modern Signalling Systems

Computerized/Electronics  Interlocking

South Central Railway has adopted the state of art of interlocking technology in the form of computer controlled interlocking for the first time on Indian Railways. The first system was commissioned on 10.07.1994 at Kavali station in Vijayawadad division. It cuts down installation time and makes modifications easier and less time taking.


                                          Computerised Electronic Interlocking

Digital Axle Counters

South Central Railway has been the test bed for Digital Axle Counters. To start with the state of art Digital axle counters imported from Germany have been provided between  Moula-Ali and  Cherlapalli  railway stations. These axle counters are compact and highly reliable. The Digital Axle counter based Block proving called BPAC is provided over various locations in Vijayawada, Secunderabad, Nanded , Guntur and  Guntakal divisions using indigenously developed Digital Axle Counters.


Single Section Digital Axle Counter for Block Proving


            High Availability Single Section Digital          Multi Section Digital Axle Counter

                Axle Counter for Block Proving

Second Distant Signal

For improved visibility of signals and small reaction time of the drivers to control trains especially at high speeds second distant signal is mandatory. It increases the confidence level of the drivers and gives them sufficient time to control the trains at high speeds. This has been introduced on Rajdhani route between Balharshah - Kazipet – Vijayawada - Gudur, Kazipet - Secunderabad- Wadi - Guntakal  - Renigunta sections, of South Central Railway.

Intermediate Block Signalling (IBS)

IBS is provided on trunk routes to increase line capacity by splitting the block section into two parts. Two trains can be accommodated in the Intermediate Block signalling section improving the throughput.

Automatic Signalling

Automatic signalling is provided in suburban and high density traffic sections to increase Line capacity. 

Light Emitting Diode Signals

The conventional Filament type signaling Lamps are replaced with Light Emitting Diode (LED) to enhance the reliability and visibility of the signals. 


Data Loggers

Data Loggers are microprocessor based systems

for logging the progression of important signalling

& interlocking events taking place at stations.

Data loggers  are installed at stations provided with

Route Relay Interlocking/ Panel Interlocking /

Electronics Interlocking. Data loggers help in

Preventive maintenance and analysis of Signal Incidences.

Intergraded Power Supply (IPS) 

SMPS based Integrated Power Supply Systemsare being provided for Signalling Installations.By providing these systems, various voltages required for signalling sub-systems can be derived form IPS alleviating the need for battery banks.



Providing basic telecommunications facilities for the Railways vast transport system is the responsibility of the Signal & Telecom Department. The telecommunication facilities provided on the Railways are broadly categorized in to three areas of applications.

-Train Operation

-Data Communication for Railway Information Technology Applications

-Administrative Communications.

Telecommunication for Train Operation

Provides omnibus communication circuits on ofc and Quad cable and overhead telecom wires for operation of trains and other supporting activities of train control. The omnibus circuit provides telephone communication between the station-masters and the control centre at the divisional headquarters. Other omnibus circuits are also provided for other supporting train operations, including remote operation of 25 KV AC power supply systems required for electric traction. Emergency communication facility is provided along with the track throughout the route for the rivers and guards of the running train to communicate to the control centre at the respective divisional headquarters during emergencies.

1)  Optical Fibre Communication

Optical Fibre Communication system is the backbone of Railways Telecommunication Network. The short-haul STM1 equipment of 155 Mbps capacity is provided at every station along the fibre network.  The short-haul STM1 network is protected  by long-haul STM4 / STM16 self healing ring network provided by RailTel. The fibre network carriers Voice, Data & Multimedia services for various applications.

 2) Data Communication

Data communication circuits for computerized Passengers Reservation System (PRS), Unreserved Ticketing System (UTS), Crew Management System(CMS), Freight Operation Information System(FOIS), Coach Operation Information System(COIS), Management Information System (MIS) etc. and in-house E-mail facilities are provided by Signal & Telecom branch.

3) Telephone Exchanges

Telephone Exchanges are provided at various divisions and other important locations for Railways internal Communication requirements.

                 a)   Closed User Group

Mobile Communications are Provided to officers and supervisor staff in SCR .Recently CUG Mobile phones are also provided to loco pilot, assistant loco pilot and guards of all Divisions.


Signalling & Telecom Infrastructure

Signalling : 

           Panel Interlocking                                                        499 stations

           Route Relay Interlocking                                                04 stations

           Electronic Interlocking                                                  71 stations

           Colour light  Signaling                                                  578 stations

           LED Signals                                                                578 stations

           Data loggers                                                                573 stations

           Track Circuiting                                                             570 stations

           Interlocked LC Gates                                                     876 Nos.

Telecom :

         OFC Network

             5456 Route kms

Cable Network


          Quad cable

           6170  Route Kms.

          Electronic Exchanges

          107  nos.

          25 W VHF sets

          589 block stations

          BSNL telephones

           585 block stations


 Passenger Amenities

The Signal & Telecom Department provides various passengers amenities for the benefit of travelling public.

Public Address System is provided at various stations to announce the arrival & departure of trains and other information required by travelling passengers. This facility is available at 278 stations on this Railways.

Train Arrival Departure Information is provided through Rail Sampark Centralized Service 139

Train Indication Boards are provided for indicating the train timing and platform numbers at 112 important Railway stations.

Coach Indication Boards are provided for indicating the coach position of the train on the platform at 92 important Railway stations.

The CCTV surveillance system is provided at 42 important Railway stations.


RAILNET infrastructure provides Corporate Wide Information System for Indian Railways.  The network connects all the 16 Zones and 6 production units.  All the 6 divisional headquarters  Secunderabad, Hyderabad, Vijayawada , Guntur,Nanded& Guntakal  of South Central Railway are connected to RAILNET. 

Recently, the Headquarter and the divisions have been migrated from leased line point-to-point WAN links to IP MPLS VPN network provided by M/s RailTel Corporation of India Ltd.  The network provides Management Information System, Electronic Data Interchange and enables sharing of information among various units of Railways.  Internet service has been provided through this network.  The HQ network is provided with a Mail Server and a Web Server.

E- Office


 This site is last updated on 23-08-2018.

Telecom Assets Details over S.C.Railway


Telecom facility provided



No. of Stations provided with Publc Address system for Train information anouncements at stations



No. of Stations provided with GPS/ Digital clocks



No. of Stations provided with Train Indication Boards for displaying Train arrival/ Departure information.



No. of Stations provided with Coach Indication Boards for displaying Train Coach position information to Passengers.



No. of Stations provided with CCTV Surveillance Systems for security of Passengers.



No. of Stations provided with Wi-Fi facility for internet facility to Passengers.



No. of Telephone Exchanges provided for Railway Internal communication



No. of Stations/locations provided with 25 Watt VHF sets - wireless communication for Train Traffic Communication



No. of Stations provided with BSNL Telephones at Way Stations



Optical Fiber cable(OFC) available over S.C.Railway for working of Railway Control,Block,Data logger, PRS, UTS, FOIS, Railnet and long distance voice,data communication etc.

6215 Route Kms


Quad Cable available for Railway Block, LC gate, Emergency communication requirements

6393 Route Kms


V-SAT communication facility provided at Accident Relief Trains(ARTs) over S.C.Railway.

6 Locations


Sattellite Phone facility provided at ARTs/ARMEs over S.C.Railway.

22 Locations


No. of locations where Passenger Reservation Systems(PRS) available.



No. of locations where  Unreserved Ticketing system(UTS) available.



No. of locations where   Unified Counters available.



No. of FOIS (Freight Operation information system) locations available over S.C.Railway.



Rail Madad helpline - 139  provided for Passengers enquiry for General Complaints, Security issues etc..



E- Office working has been introduced for paperless working in all the offices over S.C.Railway


Source : South Central Railway CMS Team Last Reviewed on: 15-02-2021  

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