How do operators confirm switch position before a train passes?

Operators confirm switch position before a train passes primarily through visual inspection and the use of signaling systems. This method ensures that the switch is correctly aligned for the train's intended route, reducing the risk of derailments or accidents.

Visual inspection allows operators to physically check the switch's position, verifying that it is set to either the main line or a siding as required. This is a crucial safety measure, as it enables the operator to directly observe any physical conditions that might affect the switch's integrity. Additionally, signaling systems provide real-time indications of switch positions, which serve as confirmation that the switch is in the correct state for train movements.

Relying on visual checks along with signaling systems creates a robust safety protocol that is essential for maintaining safe train operations. In contrast, the other options do not provide the same level of reliability or safety assurance.