What must a train crew do if they receive notification of another train in an emergency on an adjacent track?

When a train crew receives notification of another train in an emergency on an adjacent track, the appropriate action is to stop short of the stopped train. This response is critical for ensuring safety in situations where a train might be experiencing difficulties or is immobilized. Stopping short allows the train crew to avoid any potential collisions and assess the situation without putting themselves or the other train's crew at risk.

By stopping, the train crew can maintain a safe distance, which is especially important in emergency scenarios where conditions may be unpredictable. This action aligns with standard safety protocols that prioritize the well-being of all personnel involved and helps to prevent further accidents or complications.

Responding in any other manner, such as ignoring the notification, passing at normal speed, or continuing without changes could lead to dangerous situations, such as collisions or additional accidents, making it clear why stopping short of the stopped train is the correct choice.