What could happen if there is high resistance in the TP back contact?

What could happen if there is high resistance in the TP back contact?

• A. The train could be delayed indefinitely.
• B. Second or third car may trip while passing a clear signal.
• C. Train will stop at every signal.
• D. Signal aspect will change unpredictably.

Answer: (B)

High resistance in the TP (Train Protection) back contact can lead to unexpected behavior in the signaling system, particularly concerning the safety and operation of trains. When the resistance is too high, it may prevent the appropriate detection of the train's presence or status by the signaling system. This can cause the train's safety mechanisms to malfunction, which often results in the second or third car tripping when passing a clear signal. In a properly functioning system, the back contact ensures that signals appropriately communicate the operational condition to the train. However, when high resistance occurs, it may cause signals to provide incorrect information about their status. As a result, safety systems could misinterpret a clear signal, creating the risk that subsequent cars cannot respond appropriately. This scenario is critical, as it can compromise safety and lead to operational failures. The other options suggest various consequences of high resistance, but they either imply complete operational failure or excessive disruptions that are not directly related to the high resistance issue in the TP back contact. The essence lies in the direct implications of high resistance on the detection systems and how it can specifically lead to misinterpretations of signal aspects by trains.

High resistance in the TP (Train Protection) back contact can lead to unexpected behavior in the signaling system, particularly concerning the safety and operation of trains. When the resistance is too high, it may prevent the appropriate detection of the train's presence or status by the signaling system. This can cause the train's safety mechanisms to malfunction, which often results in the second or third car tripping when passing a clear signal.

In a properly functioning system, the back contact ensures that signals appropriately communicate the operational condition to the train. However, when high resistance occurs, it may cause signals to provide incorrect information about their status. As a result, safety systems could misinterpret a clear signal, creating the risk that subsequent cars cannot respond appropriately. This scenario is critical, as it can compromise safety and lead to operational failures.

The other options suggest various consequences of high resistance, but they either imply complete operational failure or excessive disruptions that are not directly related to the high resistance issue in the TP back contact. The essence lies in the direct implications of high resistance on the detection systems and how it can specifically lead to misinterpretations of signal aspects by trains.