What signals protect the east end of Johnson Avenue Yard tracks 1-4?

• A. Westbound semaphore signals
• B. Automatic block signals (ABS)
• C. Flag signals at track 1
• D. Eastbound color light low home signals (JAw)

Answer: (D)

Understanding yard entry protection is key here. The east end of Johnson Avenue Yard where tracks 1-4 begin is protected by signals placed at that entrance to control movements coming into the yard from the east. These are eastbound color-light home signals, specifically the low home type. As color-light signals, they use colored lights to show whether a move into the yard is allowed, and the “home” status marks them as the signals that govern entry into the next section from the yard’s boundary. The “low” designation distinguishes the particular mounting style used at this end.

Why the other options don’t fit: westbound semaphore signals would govern the opposite end and use a different signal type; automatic block signals cover mainline blocks rather than yard entrances; flag signals at track 1 imply a manual, non-automatic protection method; eastbound signals of a high home type would be a different mounting arrangement. The eastbound color-light low home signals are the ones positioned to protect the east entry into the yard, making them the correct choice.