What should you do when a switch is moved by the crew on a main line?

• A. Ignore the switch.
• B. Confirm the new switch position, verify route alignment, and ensure necessary protection.
• C. Notify passengers.
• D. Back up and re-check later.

Answer: (B)

When a switch on the main line is moved, you must first verify exactly where the switch is now set, then confirm that the route ahead is aligned as intended, and ensure the proper protection is in place before any train proceeds. Verifying the switch position means checking the physical indicator or switch stand to see which track the turnout directs you to. Verifying route alignment means checking that the signals, switch position, and any written authority all agree on the correct path, so the train isn’t routed onto an incorrect or unsafe track. Ensuring protection involves arranging the necessary safeguards—communication with the dispatcher or crew, and any required blocking, signaling, or other protective measures—to prevent conflicting movements and protect the route.

This sequence is essential because a moved switch can change the train's path and introduce hazards if the route isn’t confirmed and safeguarded. Ignoring the change, delaying protection, or taking the action for passengers is unsafe and inappropriate.