What is required for the operation of electrically locked switches or derails?

For the operation of electrically locked switches or derails, it is essential to adhere to special instructions or posted guidance. These procedures are put in place to ensure safety and operational efficiency. They provide critical information on how to safely handle and operate the electrically locked devices, considering their complexity and the risks involved in their incorrect use.

Special instructions may include specific protocols for accessing the switch or derail, details about the status of the locking mechanisms, and guidance on the correct communication procedures among crew members. This ensures that all personnel involved are on the same page and helps prevent accidents or operational errors that could arise from misunderstanding or miscommunication.

While the other options could arguably relate to operational practices in different contexts, they do not specifically address the foundational requirement for operating electrically locked switches or derails, which is adherence to established special instructions or guidance.