A "train tunnel" is a passage underground that allows trains to go through mountains or cities without disturbing the surrounding area. It is a space where trains can travel, and it is usually dark inside. Full definition
Govs. Andrew Cuomo and Chris Christie on Thursday committed to pay for about half of a vital new train tunnel under the Hudson River, putting pressure on the Trump administration to fund the rest. (amny.com)
The Metropolitan Transportation Authority is considering two proposals to shut down the L train tunnel between Manhattan and Brooklyn that would close the subway line under the East River or reduce its service by 80 percent. (nystateofpolitics.com)
Trenton Doyle Hancock stands beside his installation at the Hermann Park train tunnel commissioned by the Hermann Park Conservancy's Art in the Park program. (sfgate.com)