Which term refers to a main track upon which trains are operated in both directions?

• A. Siding
• B. Single Track
• C. Two or More Tracks
• D. Push-Pull Train

Answer: (B)

When trains run in both directions on the same route, the main track is described as a single track. This means there’s only one pair of rails used by traffic in either direction, so trains must coordinate with passing points or sidings to let opposing trains meet safely. A siding is a secondary track used to hold a train or to allow another to pass on a single-track line, not the main line itself. Having two or more tracks would allow trains to travel side by side on parallel lines, which isn’t the single-track scenario. Push-pull describes how a train is operated, not the track layout. So the term that fits is single track.