| 摘要 |
A track circuit is disclosed and includes rails which are fed from a main signal transmitter and which rails, at an information point a required distance from the transmitter, are shunted by a cross impedance, with which impedance, with respect to the track of the main signal, an additional transmitter of an auxiliary signal and a main receiver for receiving signals from the main and additional transmitter are serially connected. A signal indicating a free track is obtained if the main receiver is energized.
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