Role of the Signalling & Telecommunications Department
- Safety in train operations
- Punctuality of running of trains
- Optimum utilization of line capacity
- Passenger amenities
- 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)
- Management of Railways Corporate Wide Information System (RAILNET)
Elements of Safety in Train Operation
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.
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.
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 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
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 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 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.
-Data Communication for Railway Information Technology Applications
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
Panel Interlocking 493 stations
Route Relay Interlocking 04 stations
Electronic Interlocking 66 stations
Colour light Signaling 569 stations
LED Signals 569 stations
Data loggers 567 stations
Track Circuiting 567 stations
Interlocked LC Gates 948 Nos.
5141 Route kms
6046 Route Kms.
25 W VHF sets
579 block stations
577 block stations
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 277 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 90 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.
This site is last updated on 12-01-2017.