New York's Topography Challenges
Clip: Season 9 | 1m 38s
Construction on New York's underground rail system began in 1900 with William Barclay Parsons as the project’s chief engineer. The city's topography presented a special engineering challenge for Parsons and his team. With many dips, valleys, patches of quicksand and above-ground infrastructure to take into account, digging underneath Manhattan became a monumental task.
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In June, 1902, subcontractor, Ira Shaler, suffered a fatal accident in the east tunnel.
Running New York's subway would require the most powerful electrical plant in the world.
In the late 19th-century, an engineer was regarded as a god-like figure.
At least 7,700 men would be needed to build the Interborough Rapid Transit, or IRT.
Alfred Ely Beach had an idea for a pneumatic subway, pulled by a rope of air.
The first effort to build a subway dates back to the 1850s with Alfred Ely Beach.
The Pennsylvania Railroad announced they would be tunneling into Manhattan.
The masonry work on Pennsylvania Station began in 1908.
Measurements showed that the Pennsylvania RR Hudson River tunnels were shifting.
Tunneling under the Hudson river proved easy, but the East River was becoming a nightmare.
In 1961 the Pennsylvania Railroad announced it had sold the air rights above Penn Station.
Two city blocks, or 28 acres, were initially cleared for Penn Station’s construction.
Excavation workers, called “sandhogs,” faced many dangers working in a confined space.
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