What should a train do if it stops or its speed is reduced below 10 mph after entering a block on a proceed indication in ABS Territory?

In ABS (Automatic Block Signal) Territory, when a train has entered a block on a proceed indication and subsequently stops or its speed is reduced below 10 mph, the appropriate action is to proceed at restricted speed until the next signal is visible and it displays a proceed indication.

This procedure is crucial for maintaining safety in the railway system. By operating at restricted speed, the train crew is better positioned to respond to any potential hazards, obstructions, or unexpected conditions that may arise ahead. Restricted speed permits greater caution, ensuring that the train can stop within one-half of the distance to any potential obstruction or signal, enhancing safety for both the train and any unexpected situations on the track.

The context of other options is important to understand the reasoning behind this correct choice. Proceeding at normal speed would be unsafe, as it does not account for potential risks in the block ahead. Waiting for further instructions from the control center could delay necessary actions to ensure safety and may not be suitable in situations where immediate response is essential. Returning to the previous block to reassess would not be appropriate because the train should be focused on safely proceeding forward rather than backtracking, which could create confusion and disrupt railway operations.

Thus, the instruction to proceed at restricted speed until