A designated track upon which trains may be operated without timetable or Form L authority, or block signals subject to the prescribed signals, rules and special instructions.

• A. Main Track
• B. Secondary Track
• C. Controlled Siding
• D. Industry Track

Answer: (B)

The track category being tested is about how authority to move trains is tied to different track types. A secondary track is a designated line where trains may operate without timetable or Form L authority, yet you still must follow the prescribed signals, rules, and special instructions. This means you can move there under general signaling and rules rather than needing the formal timetable/Form L authorization that the main track requires. The main track is the primary line that normally operates under a timetable and Form L; moving there without those approvals isn’t allowed. A controlled siding is a signal-controlled track used for specific operational needs and usually requires explicit control, while an industry track serves specific facilities and isn’t intended for regular moves without the proper authority. So the described track fits the concept of a secondary track.