What procedure must be followed when throwing switches for a train about to utilize a crossover?

When a train is preparing to utilize a crossover, the procedure stipulates that both switches of the crossover must be open before the crossover movement begins. This is crucial for safety and operational efficiency. Ensuring that both switches are properly aligned and open prevents potential derailments and guarantees that trains can transition between tracks smoothly and safely.

If only one switch is cleared, there is a significant risk of collision or derailment as the train could encounter a closed switch while using the crossover. Enabling the switches to be manipulated during the movement compromises safety and could lead to accidents. Moreover, relying on previously checked switches can be dangerous, as conditions might change or previous checks might have missed recent issues. Proper protocol calls for a thorough and current check of both switches to ensure that both are fully functional and correctly positioned before the train engages the crossover.