N.J. Stat. § 40:23-6.50
Whenever a railroad company shall not properly construct and maintain on its property in any county any structures, ditches, watercourses, dykes, dams, and such other works and such filling and excavating necessary to control the flow of surplus and surface waters for the protection of the public health, safety and welfare, the governing body of such county may, after notice to the company and approval of the construction plans and specifications by the company within 90 days of their submission, enter upon such property and construct and maintain such works, fillings and excavations.
The county shall not be required to make compensation to such railroad for entering upon such property and constructing and maintaining such works, fillings and excavations.
N.J.S. § 40:23-6.50