The invention relates to a device (10) for monitoring the integrity of a train (1) carrying a first vehicle (3.1), a last vehicle (3.3) and a power supply line (5) running between the first (3.1) and last vehicle (3.3) ) comprises, with at least one train terminal device (8) arranged on the last vehicle (3.3), which is connected to the power supply line (5) and is designed to regularly transmit a function signal, with at least one train start device (7) arranged on the first vehicle (3.1), which is connected to the power supply line (5) and designed to receive the function signal, and with at least one evaluation device (9) connected to the train start device (7), which monitors the reception of the function signal at the train start device (7) According to the invention, it is provided that the train terminal device (8) for transmitting the function signal via the power supply line (5 ) is designed by powerline communication. The invention also relates to a method for monitoring the integrity of a train (1).
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