What must a train do before approaching the next home signal after stopping?

The requirement for a train to prepare to stop before approaching the next home signal after stopping is rooted in safety procedures that help ensure the safe operation of trains. When a train stops, especially in preparation for signals indicating whether to proceed or stop, it is essential for the crew to be in a position to respond to the signal's indication safely.

Preparing to stop allows the crew to assess the conditions ahead and prepare for possible stops based on the upcoming signal's indication. Home signals are instrumental in controlling train movements, and by ensuring the train is prepared to stop, it allows for a greater margin of safety in case the signal is red or requires the train to halt. This procedure also supports the protocol of cautious and controlled operations, which is vital for maintaining order and safety on the rail network.

The other options do not align with the necessary safety protocols. For instance, accelerating to full speed without assessing the signal could lead to dangerous situations if a stop is required. Using a signal horn may be a requirement under certain conditions, but it does not replace the fundamental need to be prepared for stopping at a signal. Checking for oncoming trains is certainly important, but that action is typically part of broader operational protocols and does not specifically address the immediate need to prepare