In NYC we've had many tunnels for beginning about 100 years ago -- for the subways and also for trains and cars under the Hudson River. Recently there have bee

In NYC we've had many tunnels for beginning about 100 years ago -- for the subways and also for trains and cars under the Hudson River. Recently there have been tunnels made for the Second Ave subway which should be opening soon. Last year, there was a tunnel made for subways below 42nd st for the 7th Ave extension from Times Square to the Javitts Convention Center. Another tunnel from commuter rails in Queens to Grand Central Station. Many of the subway lines have tunnels for 4 tracks: for both local and express, the later which skip multiple stops. Incidentally, like Tesla cars, the subways are electric powered but hold 2000 people. In the case of the NYC subways, much of that electricity comes from very green hydroelectric from the Canadian province of Quebec. Other US cities should be drilling more tunnels, but for subways. "“Sixteen brand new, concrete-lined tunnels now exist under New York City where none did five years ago,” Joseph J. Lhota, the agency’s chairman, said in a statement. “The conclusion of tunnel boring reminds us that New Yorkers remain capable of great achievements.” For seven machines, the end of tunnel boring has also meant new destinations or, in some cases, a final resting place..." http://cityroom.blogs.nytimes.com/2012/07/26/molina-a-200-ton-machine-completes-a-journey-under-the-city/ http://cityroom.blogs.nytimes.com/2012/07/26/molina-a-200-to...