When is a train required to stop clear of the switch while on the main track?

A train is required to stop clear of the switch while on the main track when the switch is not properly lined. This is critical for safety, as an incorrectly lined switch can direct a train onto a track that may be occupied or may not be intended for the train's movement, leading to potential derailments or collisions. Stopping clear of the switch ensures that the train does not inadvertently move into a hazardous situation.

Properly lining the switch is essential for directing trains safely to their intended tracks. When a switch is misaligned, it can create dangerous conditions for train operation, which is why the requirement exists for the train to halt until the switch can be confirmed as correctly aligned. This practice maintains operational safety and helps protect both the train crew and any train in the vicinity.

While other situations, such as switching operations, allowing another train to pass, or preventing fouling with maintenance equipment, may necessitate stopping trains, the specific condition of an improperly lined switch directly impacts the safety of train movement on the main track.