The oldest subway in New York City isn’t a pneumatic subway once buried under Broadway and now probably lost to time. Rather, it is a tunnel from the 1800s under Atlantic Ave. in Brooklyn. This original LIRR tunnel dates from the 1840s and has been closed since the Civil War. In 1980, Bob Diamond rediscovered the tunnel and has conducted tours of it. He now believes that he is close to uncovering a 150-year-old locomotive behind a wall near Hicks St. This weekend, The Times City Section delved into the tale of the tunnel, and the story is a must-read for any New York train buff. Check out the slideshow too.