What must be done when Signal Maintainers are working on a switch?

When Signal Maintainers are working on a switch, applying Lever Blocking Devices is essential for ensuring safety. These devices secure the switch mechanism in a position that prevents it from being inadvertently moved while maintenance is ongoing. This precaution helps avoid accidents or unintended changes to the switch position, which could lead to misrouting of trains or derailments.

Using Lever Blocking Devices establishes a clear protocol that allows maintenance personnel to work safely without the risk of equipment being activated or manipulated while they are performing their tasks. It also serves as a visual indicator to other personnel and train operators that the switch is under maintenance and should not be engaged.

This practice is part of standard safety measures in rail operations, emphasizing the importance of maintaining a controlled environment during maintenance to protect both workers and trains.