What should be done before removing a wall (auxiliary) trolley from a car?

Before removing a wall (auxiliary) trolley from a car, shutting off the switch box is essential for ensuring safety. This action typically involves disabling any electrical systems that could pose a risk during the removal process. By shutting off the switch box, operators mitigate potential hazards such as electric shock or unintended activation of equipment. This step helps establish a secure environment, which is critical when working in proximity to electrical components. It’s a preventive measure that aligns with established safety protocols in engineering practices related to the maintenance or modification of transport vehicles, ensuring that all personnel remain safe during the operation.