| 摘要 |
A railroad track monitoring device has a response device disposed at the front and end of every train, the response devices being capable of transmitting one of a number of different signals to a sampling device. The number of signals is at least twice as large as the number of trains on the system. The track is subdivided into a number of successive path segments and an interrogation device is disposed at the boundary of every two adjacent path segments. Each interrogation device has a memory allocated thereto for storing the last-received signal from a train passing the interrogation device, and a series of comparators for comparing the signals received from interrogation devices associated with adjacent track segments releases an occupied signal or a open track signal upon coincidence or difference of the most recently received information from the two track sections behind the front of the train. |
