When can a passenger train proceed to the station across a main track?

The correct answer is that a passenger train can proceed to the station across a main track if assurance from the Dispatcher is obtained. This is an essential safety measure that ensures communication and coordination between the train crew and the Dispatch staff, who have the real-time overview of the railway network and any potential hazards.

When the Dispatcher provides assurance, it indicates that the main track is clear for the train to proceed. This prevents situations where a train might inadvertently enter a segment of track that could pose a risk due to another train's presence or ongoing work in the area. The Dispatcher's role is critical in maintaining safety and operational efficiency, ensuring that all movements across main tracks are well-coordinated.

Other options, such as having no signals on the track, traveling below 10MPH, or making an emergency stop, do not sufficiently ensure the safe crossing of a main track. Each of these scenarios could still involve risks, such as the presence of another train or an obstruction on the track, highlighting the importance of having explicit confirmation from the Dispatcher instead.