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Explore the forgotten engineering marvel of New York's double-decker elevated railway system in this 21-minute historical documentary. Discover how these stacked stations, two-tier junctions, and sky-high platforms dominated the city's transit landscape before the subway system tunneled beneath Manhattan. Learn about the complex network where express trains thundered over local services and ferry terminals connected directly to upper-level walkways, creating what was essentially a second city in the sky. Examine the rise and dramatic fall of this vertical transit system, understanding why these costly and eventually outdated giants disappeared by 1973, leaving only hidden fragments visible today. Uncover the engineering challenges, urban planning decisions, and social factors that led to the demolition of one of New York's most ambitious transportation projects, while exploring the remnants that still exist hidden in plain sight throughout the city.
