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Reports and Surveys

COMMUNICATIONS SYSTEMS 1. Satellite Communications for Trains The Japanese National Railways are now using Japan's first operational satellite to provide communications back-up for the high speed 'bullet trains' in the event of earthquakes. This it appears is the first report of satellites being used for railway safety communications in Japan, although applications in ships navigation are common place. The need in Japan is to minimise the dangers of sudden earth tremors which could seriously damage the lines which can be used by trains at speeds up to 150 mph. The trains must be stopped quickly and cutting off the power supply by remote control appears to be the quickest way of achieving this. The electric substations being linked by landline to distance seismic sensors could also be affected by the earthquakes. To preserve the integrity or its communications systems the Japanese National Railways have now leased part of the satellite's telecommunications capacity.