Which of the following is true about a train number that starts with 9xxx?

The option that indicates the train number starting with 9xxx signifies that it originates or terminates at Roberts Avenue Yard is accurate due to the specific numbering system used within the SEPTA network. Train numbers beginning with 9 typically denote movements associated with yard operations, including trains being used for storage, maintenance, or service transitions that operate to and from Roberts Avenue Yard.

Understanding the coding of train numbers is essential for proper identification of service types and their related functions in the rail system. This specific convention ensures that conductors and engineers can quickly recognize the operational characteristics of the train, such as its starting or ending point being at a yard facility rather than a station or typical passenger stopping point.

Other options, while they may pertain to train operations, do not apply specifically to the 9xxx designation as directly as the reference to Roberts Avenue Yard does.