How must a train approach switches where utility assistant conductors are stationed?

The correct answer is that a train must approach switches where utility assistant conductors are stationed at restricted speed. This is important because restricted speed allows for greater caution when approaching areas where workers are present. Operating at restricted speed means that the train can stop within half of the range of vision and allows the crew to be prepared for any unexpected actions that might be necessary, such as stopping for a utility assistant conductor who may be directing movements or ensuring safety in the area. This speed ensures not only the safety of the train crew and the utility assistant conductors but also complies with operating protocols designed to prevent accidents and enhance overall safety in the rail environment.

Higher speeds, such as normal speed or maximum speed, would significantly reduce the ability to respond to unforeseen issues, making them inappropriate in this context.