NYC's East Side Access project poses challenges for engineers

05/28/2013 | Wired.com

Engineers working on the East Side Access project in New York City must finish three difficult segments in order to build a new railroad 160 feet below street level. The project includes excavation of a terminal underneath Grand Central with two caverns 1,050 feet long that feature eight separate platforms; installation of coolant coils in the ground to form a protective arch of frozen soil to prevent collapse of soft ground at the Northern Boulevard Crossing; and digging of the main tunnel below the Harold Interlocking.

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