What should a train operator ensure when approaching a home signal with route request buttons?

When approaching a home signal with route request buttons, a train operator's main responsibility is to ensure that the route is properly aligned. This means checking that the signals and points are set correctly to allow the train to proceed safely onto the desired track. A misaligned route could lead to potential derailments or accidents, making it imperative that the operator confirms the alignment before proceeding.

Properly aligned routes ensure that all necessary signaling aspects are functioning as intended, which contributes to the overall safety and efficiency of train operations. This is crucial especially in complex rail networks where multiple routes intersect. Without correct route alignment, even a clear signal may pose significant risks.

The other choices, while relevant to train operations, do not specifically address the immediate concern when approaching a home signal with route request buttons as directly as route alignment does.