Abstract: A radio system for communications transmission between transmitting/receiving stations moving along prescribed routes and stationary transmitting/receiving stations arranged along these routes at prescribed intervals and effective in both route directions, provides that the stationary stations of one route are connected by way of cable to a central transmitting/receiving station. A carrier signal generator is connected to that end of the cable which is farthest from the central transmitting/receiving station and an amplitude modulator is connected parallel at the locations along the cable provided for the input of signals and formed by the stationary transmitting/receiving stations, and are respectively connected by way of a transformer having a high transmission ratio. A demodulator having a threshold value circuit is inserted in the central transmitting/receiving station at the end of the cable. The radio system is of particular advantage in railway radio.