N.J. Stat. § 48:12-136
When railroad companies have consolidated or merged their corporate franchises and property as provided in this article, the new company so created in the case of a consolidation or the acquiring and surviving company in the case of a merger, shall file and record a survey of its line or lines in this State and file a map thereof in the office of the Secretary of State, and therein may relocate any part of its routes not constructed and locate new routes on making the deposit required by section 48:12-8 of this Title.
The line or lines described on such survey or map shall be the line or lines of such railroad company in this State and all other routes, lines or locations in this State not actually built upon shall be deemed to be abandoned.
N.J.S. § 48:12-136