When is it permissible to turn off the headlight of a train?

Turning off the headlight of a train is permissible when the train is stopped clear of the main track. This is because headlights are primarily used for visibility and safety while a train is in motion, both for the crew operating the train and for any other trains or personnel in the vicinity. When a train is completely stopped and safely positioned away from the main operating track, the need for the headlight diminishes, making it acceptable to turn it off.

Maintaining the headlight while moving, especially through populated areas or during operations where other trains may be present, ensures safety and helps prevent accidents. Therefore, option B recognizes the conditions under which it is appropriate to deactivate the headlight without compromising safety protocols.