Before lining signals for testing, what must employees ensure?

Before lining signals for testing, employees must ensure that train operations are not affected. This is crucial because the integrity and safety of train operations are the top priorities in rail transport. If signals are lined for testing without guaranteeing that they do not impact train movements, it could lead to confusing signals for train crews, potentially causing unsafe conditions or accidents.

Maintaining a clear understanding of train operations and ensuring they can continue safely while testing signals is essential. This includes ensuring that any trains currently operating in the area are accounted for and that their movements are not compromised by the testing procedure. Doing so allows for a safe and effective testing environment where signal functionality can be verified without endangering the operation of trains.