What is the minimum duration a train must be held to equalize heat through overheated wheels?

The correct duration for holding a train to equalize heat through overheated wheels is 10 minutes. This time allows for the thermal energy in the wheels to dissipate and distribute evenly. Overheated wheels can lead to safety hazards and mechanical issues if not addressed promptly.

In the context of train operations, it's crucial to balance the heat throughout the wheels so that they all operate under similar thermal conditions, which helps maintain performance and safety. The 10-minute duration has been established based on operational best practices, ensuring that the wheels have adequate time to cool while not being unduly delayed for longer than necessary.

By recognizing the importance of this specific time frame, train dispatchers can manage train schedules effectively while prioritizing safety and equipment integrity.