Concerning the use of crossover switches, which of the following apply?

Both of the statements regarding the operation of crossover switches – that both switches must be properly lined before a train or engine begins movement and that the movement must be completed before either switch is returned to normal position – are essential practices in ensuring safe and effective train operations.

When it comes to crossover switches, safety and efficiency are paramount. Before a train is allowed to move through a crossover, it is crucial that the switches are aligned correctly to prevent derailment or accidents. Properly lining both switches ensures that the train will follow the intended path safely.

In addition, the requirement that the movement must be completed before either switch is returned to the normal position is in place to avoid potential accidents. If a switch were to be returned to normal while a train is still moving through, it could lead to a dangerous scenario where the train could be diverted unexpectedly, increasing the risk of a collision or derailment.

Therefore, adhering to these practices is vital for the safety and smooth operation of rail systems, which is why the combination of both statements is the correct choice.