If a train in CTC territory enters a block on a proceed indication and reduces speed below 10 MPH, what must the train do next?

When a train in Centralized Traffic Control (CTC) territory enters a block on a proceed indication and subsequently reduces its speed below 10 MPH, it is required to proceed prepared to stop until the next signal is visible. This rule is in place to ensure the safety of train operations by allowing the crew to react promptly to any signals they may encounter ahead.

Maintaining a speed below 10 MPH means that the train is likely approaching a point where the conditions may require a stop, such as if there’s an upcoming signal that could restrict movement or if there are any other operational concerns. By proceeding prepared to stop, the crew is ensuring that they can respond to changes in signal indications or other operational needs that arise as they continue along the track.

This procedure emphasizes the need for vigilance and readiness to act upon signals that guide the train's journey, particularly when traveling at lower speeds. The requirement to be prepared to stop at visible signals helps ensure that trains do not inadvertently pass through restricted areas or fail to comply with signal indications, thereby promoting operational safety within the rail network.