Abstract: A device detects an occupied state or a free state of a track section and has a transmitter for feeding a transmission signal in the form of an alternating voltage into the running rails of the track section and at least one receiver for receiving a reception signal which is brought about by a transmission of the transmission signal via the running rails of the track section. In order to be able to detect faults in the device, in particular cable faults, particularly reliably and at the same time cost-effectively, the device accordingly is configured to determine a phase shift between the transmission signal and the reception signal. A method for operating such a device is further disclosed.

Abstract: A device detects an occupied state or a free state of a track section and has a transmitter for feeding a transmission signal in the form of an alternating voltage into the running rails of the track section and at least one receiver for receiving a reception signal which is brought about by a transmission of the transmission signal via the running rails of the track section. In order to be able to detect faults in the device, in particular cable faults, particularly reliably and at the same time cost-effectively, the device accordingly is configured to determine a phase shift between the transmission signal and the reception signal. A method for operating such a device is further disclosed.

Abstract: An apparatus for the detection of an occupied or free state of a track section, which is particularly simple and at the same time particularly resistant to interference influences, includes a transmitter for feeding a transmitted signal, encoded by modulation, into rails of the track section and at least one receiver for receiving a received signal which is brought about by transmission of the transmitted signal through the running rails of the track section. The apparatus compares the modulation of the received signal with the modulation of the transmitted signal. A method for operation of an apparatus for detection of the occupied and free state of a track section is also provided.

Abstract: A method and a device for detecting the occupied or free status of a section of track by way of a track current circuit, into which a transmitted signal is introduced and from which at least one detection signal is extracted. A longer maximum possible track length is achieved in that the track current circuit is divided into part sections overlapping over half the length thereof. The transmitted signal is introduced in the middle of each part section into which a rail vehicle enters, detection signals being extracted at both ends of the part section or further transmitted over adjacent part sections to the track circuit ends and extracted there. Each part section is provided in the center and the ends thereof with transceiver devices. The central transceiver device functions as a transmitter and the end transceiver devices function as receivers.

Abstract: A method and a device for detecting the occupied or free status of a section of track by way of a track current circuit, into which a transmitted signal is introduced and from which at least one detection signal is extracted. A longer maximum possible track length is achieved in that the track current circuit is divided into part sections overlapping over half the length thereof. The transmitted signal is introduced in the middle of each part section into which a rail vehicle enters, detection signals being extracted at both ends of the part section or further transmitted over adjacent part sections to the track circuit ends and extracted there. Each part section is provided in the center and the ends thereof with transceiver devices. The central transceiver device functions as a transmitter and the end transceiver devices function as receivers.