Wall Street may be having a rough week, but there's clear progress happening underneath New York's financial institutions


As part of its plan to redevelop the warehouse district around Hudson Yards, the city of New York has undertaken a $2.1 billion, two-mile expansion of the No. 7 subway line from Times Square to 11th Avenue. The No. 7 crosses just about every other NYC subway line; extending it to the yards will give most New Yorkers access to the soon-to-be-developed neighborhood west of Eighth Avenue and north of 34th Street. The project broke ground in 2007 and is now nearing the end of its heavy construction phase.

The development of the yards has been sluggish. But controversies aside, carving massive tunnels underneath one of the world's largest cities is an extreme feat of engineering. The MTA is expanding other parts of the rail system as well, including a Grand Central Station terminus for the Long Island Rail Road.

These pictures from the MTA show expansive man-made caverns that will soon house rails, trains, and stations.

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