An element of Central Park's past will reveal itself again when the Second Avenue Subway (SAS) opens at the end of the month.
A peculiar loop cutting through Central Park appeared when the MTA released their new subway map with the addition of the SAS. The half-mile stretch was built over 40 years ago and supposedly it’s only been used twice since then.
With the help of the Transit Museum, it has been found that this “ghost line” runs between the 57th Street and 7th Avenue, and Lexington Avenue and 63rd Street in Manhattan, and was built in the 1970s as part of a past attempt to bring the Second Avenue Subway to life.
More from the original article here.