What does the train number beginning with 9xxx indicate?

A train number beginning with 9xxx is specifically designated to indicate that the train either originates from or terminates at Roberts Avenue Yard. This coding system helps railroad operators and personnel quickly identify the train's operational context, particularly in yard operations where multiple trains may be handling maintenance, storage, or servicing. Train numbers that start with 9 are distinct and are specifically used for internal movements rather than regular passenger service, making it essential for conductors and engineers to recognize this designation to effectively manage rail operations and schedules.