What is the function of an End of the Train Device (EOT)?

The End of the Train Device (EOT) primarily functions to initiate an emergency application of the train air brake at the end of the train. In situations where a critical incident occurs, such as a separation between the sections of a train or the detection of specific conditions that require immediate braking, the EOT sends a signal to the train’s braking system. This function is vital for maintaining safety, as it helps to prevent derailments and maintain control over the entire train.

By automatically applying the brakes at the end of the train, the EOT ensures that all cars come to a halt in an orderly and timely fashion, thereby minimizing the risk of accidents and injuries. This feature highlights the device's role as a crucial safety mechanism in train operations.