method and apparatus for determining the state of employment of the circuit in a circuit of a railway track

摘要

Apparatus for verifying the presence of a train on a direct current track circuit in a railway line provided with a plurality of direct current track circuits adjacent to each other, such circuit comprising a pair of tracks (R) made up of parallel metal sections (B) between which an electric voltage may be applied, each direct current track circuit is separated from the adjacent one by means of electrically insulating joints (G).