Signalling railway track section occupation - applying voltage at one end and evaluating at opposite end
CH680475A5
Digital control signal transmission system e.g. for railway signalling - provides fault or alarm signal when signal level is outside defined signal amplitude zones
CH680096A5
Monitoring simultaneous arrival of DC or AC pulse trains - using energy of one signal sequence to actuate switching element only if other signal appears at least approximately at same time
CH676903A5
Information transmission system for train - uses coded microwave signals fed between successive train sections
