A designated track, the entrance and exit of which are governed by home signals.

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

Answer: (B)

Access to a track that is controlled by home signals is a controlled siding. A siding is a track that diverges from the main line to let trains pass, meet, or park. When its entrances and exits are governed by home signals, crews must receive a clear indication at, respectively, the entry and the exit before moving onto or off the siding. This signaling arrangement protects movements on the main line by ensuring only authorized transitions into and out of the siding. The main track is the primary line and is typically controlled by different signals (block/interlocking) rather than by home signals at its ends. Industry or secondary tracks may have signaling as well, but the defining feature here is that the access points are controlled by home signals, which is characteristic of a controlled siding.