When a train is stopped in the clear of the main track to meet another train, how is the headlight displayed?

When a train is stopped clear of the main track to allow another train to pass, the appropriate procedure is to turn the headlight off. This action helps prevent confusion for the approaching train, allowing them to clearly see the track and any signals or indicators without the distraction of another train's headlight.

In this scenario, turning off the headlight signifies to the crew of the approaching train that there is no obstruction on the main track in front of them, facilitating safer and more efficient operations. The other options, such as keeping the headlight on, dimming it, or flashing it, do not serve this purpose and could lead to potential misunderstandings regarding the status of the track ahead. By turning off the headlight, it ensures that the focus remains on the signals that are essential for safe train operations.