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 The New York City Subway System (Building America: Then and Now)In 1912, workers digging to create the Broadway Subway, north of Murray Street in lower Manhattan, hit a brick wall approximately 21 feet (6.4 meters) below the street surface. Breaking through the wall, the laborers came upon a tunnel 9 feet (2.7 m) in diameter and lined with eight- inch- thick (20.32 centimeters) bricks. Two rails led into a... |  |  |  |  |
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