Nice write-up at The Verge on the proposed Lowline Park, an underground park built in an old trolley terminal in New York City. The space has been relatively untouched for over 50 years:
"Not that the abandoned trolley terminal, which opened the same time as the Williamsburg Bridge in 1903, is a neighborhood blight. In fact, it's in pretty decent shape right now. The station served elevated lines and trolley cars from Brooklyn, but closed in 1948 when trolley service was discontinued, and has been empty ever since."
One of the highlights to our trip to New York City a couple of years ago was the High Line, a park built from an abandoned elevated freight train line originally scheduled for demolition. As a train fan — I did a podcast episode about trains and animation 10 years ago — I love to see any of these historic lines preserved in a new form.