When may a movement foul adjacent track at a hand operated switch when the switch is not properly lined?

A movement may foul adjacent track at a hand-operated switch when the switch is not properly lined until the switch is properly lined. This is crucial because an improperly lined switch can create dangerous conditions by allowing trains to unintentionally enter onto tracks designated for a different route, increasing the risk of collisions or derailments.

In rail operations, ensuring that all switches are correctly aligned for the intended route is a fundamental safety protocol. If a switch is not lined correctly, any equipment or trains moving past that switch pose a risk not only to themselves but also to any trains on adjacent tracks. Therefore, until the switch is properly adjusted to the correct position, the movement should remain cautious and should not proceed into potentially unsafe zones.

This understanding reflects the importance of strict adherence to safety guidelines and procedures in train dispatching, ensuring the safety of all train movements in the area.