What does LISOP stand for in switch operations?

• A. Look, Inspect, Sweep, Operate switch and Point at correct switch points
• B. Look, Inspect, Signal, Operate
• C. Listen, Inspect, Sweep, Open switch
• D. Look, Initiate, Sweep, Operate

Answer: (A)

LISOP is a step-by-step safety check used before moving a switch. It focuses on what you should do visually and physically to confirm the route is correct and safe.

Look at the switch and surrounding track to verify the turnout is aligned for the intended route and there are no obvious obstructions or misalignments. This initial glance helps catch anything that could cause a derailment or misrouting before you touch the switch.

Inspect the switch components up close. Check the points, stock rail, and mechanism to ensure everything is in proper position and secure. This deeper check confirms that the switch has reached the intended position and is able to hold it under normal track conditions.

Sweep the area to clear debris and ensure nothing around the points could interfere with operation or tracking. A clean, unobstructed switch reduces the risk of jams or unexpected movement when the switch is actuated.

Operate the switch to move it to the desired position, and watch for proper operation and indication that it is locked in place. This confirms the action actually took effect and the switch will route the train correctly.

Point at the correct switch points to indicate the chosen route to others and confirm the target position. Verbal or visual indication helps prevent miscommunication and ensures everyone involved agrees on the route.

The chosen option reflects this sequence: Look, Inspect, Sweep, Operate switch and Point at correct switch points. The other options replace or omit steps that are integral to this safety checklist.