Movement of trains over a mainline track in the direction opposite to that prescribed by the rules for that track.

• A. Reverse Traffic
• B. Single Track Operation
• C. General Notice
• D. Signal Interlocking ABS

Answer: (A)

Moving trains on a mainline in the direction opposite to what the track’s rules prescribe is called reverse traffic. This term specifically captures the idea of a deliberate change in the usual directional flow on that track, typically under a controlled arrangement with proper authority, signaling adjustments, and safety measures. It’s the best fit because it directly describes the action of traveling in the opposite direction.

Why the other terms don’t fit: single track operation refers to the physical layout where a single track handles traffic in both directions, which is about infrastructure rather than the direction being opposite to the rules. A general notice is just a broad directive or announcement, not a description of how trains are moving on the track. A signal interlocking ABS relates to the signaling system that prevents conflicting movements at interlockings; it’s about safety logic, not specifically about moving opposite to the prescribed direction.