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ATWS

Indian Railways is the largest organization in the country with mostly open, easily accessible and unguarded assets. Today, Indian Railways track maintenance staff and other persons working on the track 24x7, experience a major problems as there is not any automatic communication system that can alarm the working staff well in advance for any approaching train to the place they are working that generally lead to accidents.

Track workers safety is a vital aspect when planning works at sites. Sanchar has set itself the task of making the work of the staff safer, who spend times in the dangerous zones of the track for installation and maintenance. We have developed safety equipment named ATWS (Advance Train Warning System-RAKSHAK) product line which safely and reliably warns workers of approaching trains and widely exclude the human-operated failure. It is like an advance digital phone-like receiver device that gives an alert sound/LED light/vibration by transmitting the warning alert when it detects the train movement from the station.

Designed by industry-leading Sanchar R&D department in compliance with RDSO specifications (RDSO/SPN/TC/105/-2015 Rev-0.0 & 1.0), this VHF based approaching train warning system safeguard against if track maintainers fail to spot a train approaching in their section while work is in progress. The radio equipment mainly consists of the stationary transmitter which will be installed in the station premises and the receiver units will be held by workers at the track. This system replaces the cable work between the treadles and the control unit and has the effect of reducing installation time. This radio-based technology is an easy and uncomplicated system.

diagram

Salient Features:

  • Bi-directional radio technology with a large radio range and Individual networks.

  • Quick and easy installation and operation.

  • Automated start-up routines.

  • Maximum flexibility and high efficiency due to the modular concept.

  • High availability and environmental compatibility.

  • Robust and lightweight design and handy components.

  • Developed as per RDSO standards RDSO/SPN/TC/105/2015.

Major Assemblies

1. Fixed VHF Transmitter: This unit will be normally installed in a Relay Room or Station Master's Room. The output of the transmitter shall be connected through suitable RF cable to the antenna mounted on the rooftop or on a mast at a suitable height to get adequate coverage in the entire section. The Transmitter Unit shall consist following sub-assemblies: Transmitter will be transmit to signal 3 times in 1 min. during to 20 second of interval. 1 time 1 minute send to healthy signal for receiver in the case of without train on track.

  • Transmitter with Suitable Modulator.

  • Power supply unit with built-in 12V/7AH Battery& Suitable charger. (Backup time 90 minutes).

  • 6 dB Antenna with LMR cable.

2. VHF Hand-held Receiver (HHR): This is a small VHF receiver unit, which will be kept by the field staff working along the railway track in the entire section. This unit will have the following features:

  • Respective signal depending upon approaching train on UP/DN tracks, a coded trigger shall be transmitted by transmitter once every after 20 seconds (Nominal). This transmitted signal will be received and decoded by the HHR present in that section only as the transmitter and receiver for a particular section will be bonded by the same unique code. In the case of without healthy signat are out of range to the receiver, receiver provide to alert for out of range.

  • The HHR will process the received signal to decode visual indicators as well as prerecorded audio alarm along with vibration to alert maintenance staff about the presence of approaching train on UP/DN track. In case, the train is approaching on both the UP and DN lines. The audio, vibration and visual alerts shall be continue on respect to green signal for train. As per transmitter command to receivers

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