N.J. Stat. § 48:15-27
Any street railway or traction company may at any time change the location of the route of any new line of railway or an extension of any existing railway, shown on the map thereof filed in the office of the secretary of state, or any part of the route of any such new line or extension, by filing an amended map showing such change and alteration of location, in the office of the secretary of state together with an amended description of the route of the new line or extension as changed.
In case the company has acquired by condemnation any land or easement therein along the original route so changed, so much thereof as is not within the amended route shall, upon the construction of the railway along the amended route, revert to the original owners thereof.
N.J.S. § 48:15-27