How far west of Jay Interlocking does the third rail end?

• A. 500 feet
• B. 2000 feet
• C. 1040 feet
• D. 100 feet

Answer: (C)

The distance is set to provide a clearly defined, safely de-energized transition area before the interlocking. Ending the third rail 1040 feet west of Jay Interlocking creates a dead section that isolates power from the interlocking equipment, allowing the switch machines and signals to operate without the risk of energizing components that are not intended to be powered. This spacing also accommodates track geometry, maintenance access, and the timing needed for trains to clear the interlocking without encountering energized rails. If the end were placed much closer, there wouldn’t be enough clearance for safe switching and protection; if it were much farther, it would waste power and complicate maintenance, so 1040 feet is the chosen balance for this setup.