What speed should trains not exceed when delayed after passing a distant signal?

When a train is delayed after passing a distant signal, the maximum speed it should not exceed is 15 MPH. This limit is in place primarily for safety reasons. The purpose of this speed restriction is to allow the crew adequate time to assess the situation ahead, ensuring they can react appropriately to any signals or hazards that may occur.

Trains are often required to operate at reduced speeds in situations where visibility is compromised or when signals indicate the possibility of an obstruction. By limiting the speed to 15 MPH, the operating rules help minimize the risk of accidents that could arise from a train proceeding too quickly after passing a signal, especially if the signal indicates that the train is entering into an area of potential danger or conflicting movements.

The other speed limits provided in the incorrect options are higher than the established safety protocol for this scenario, which does not align with standard practices designed to ensure safe train operations in the face of potential hazards.