N.J. Stat. Ann. § 54:29A-74.1

The taxes imposed by this act shall be in lieu of all other State and local taxation of or upon franchise and property used for railroad purposes. Nothing herein shall, however, be construed to affect any pending litigation, nor to repeal, abate, cancel, cause to lapse or otherwise affect in any manner any assessment or the lien or obligation to pay any taxes heretofore assessed to any taxpayer, or the local authority to collect taxes, interest and penalties which have heretofore accrued under the act to which this act is amendatory and supplementary, or under any other law, or to affect the authority of the commissioner to assess omitted property, and to apportion the tax so assessed for any year prior to the year one thousand nine hundred and forty-eight according to the classifications and at the rates then in effect.