Under what condition may you operate a rolling road switcher on the main track?

• A. Whenever you are in a hurry.
• B. Only with explicit authority and in accordance with prescribed safety procedures and clearances.
• C. Only during daylight hours.
• D. Any time there is no train in the area.

Answer: (B)

On-track movements on the main track must be controlled and protected. A rolling road switcher can operate there only when you have explicit authority and you follow the prescribed safety procedures and clearances. This ensures dispatch has accounted for the movement, trains are protected by the proper blocks or warrants, and all safety requirements (such as communication, lookouts, and protection against other movements) are in place. Without that formal authorization, no main-track operation is permitted, regardless of urgency, time of day, or the absence of nearby trains.