NYC Subway’s Secret: The Fourth Rail ⚡ | Supplemental Power Return Explained

Did you know the New York City Subway uses more than just the third rail? 🚇 In this quick dive, we explore NYCT’s Fourth Rail-a supplemental power return system that keeps trains running smoothly and safely.
Learn how this lesser-known part of the subway’s power setup helps manage electrical flow and supports the system’s efficiency, especially in A Division lines like the Dyre Avenue Line.
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