Automatic warning of track maintenance gangs

Summary

The goal of the leaflet is to specify the requirements for an automatic warning system.

Such a system aims at:

automatic warning of approaching rail vehicles in adequate time, with a high degree of safety, for staff working on or near tracks,

reduction of the staff needed for track-gang warning.

The leaflet is based on Report, Part 1, of the ORE1 A 124 Specialists Committee.

The system consists in an announcement part and a warning part, so designed that each part can operate separately.

The system is specified for operation till 200 km/h.

It is based on a radio transmission in the 160 MHz and 460 MHz frequency ranges.

A system based on the GSM-R frequency range is out of the scope of the present leaflet.

The leaflet is specified in a very detailed way. It includes:

Operating conditions:
for the complete warning system, detector, announcement transmitter, warning centre - including announcement receiver and warning transmitter, warning receiver, warning signal generator,

Safety and reliability requirements,

Technical requirements - including environment and design:
for the complete warning system, detector, announcement transmitter, cables for the announcement transmission line and warning transmission line, centre - including announcement receiver and warning transmitter, warning receiver with acoustic warning signal, warning receiver with optical warning signals, acoustic warning signal generator, optical warning signal generator and continuous warning light.

Concepts, definitions, block diagram and warning signal are given in Appendix A.