N.J. Stat. § 48:12-62
The railroad company or companies involved shall pay 15% and the board, out of funds to be provided for that purpose, shall pay 85% of the entire expense of such alterations, reconstructions, changes, relocation or opening, including damages to adjacent property and the cost of removing, relaying or relocating any municipal pipes, conduits or subways.
In lieu of the apportionment of expenses as set forth above, if the board finds that such alterations, reconstructions, changes, relocations or openings are necessary due to increased vehicular or pedestrian traffic within the limits of the municipality or county having jurisdiction over such public highways involved, the board may order such expenses to be paid as follows: 15% by the railroad company or companies involved, 15% by the municipality (or municipalities) or county (or counties) having jurisdiction over such public highways involved and 70% by the board.
The municipalities and counties involved are hereby authorized and empowered to make such payments.
N.J.S. § 48:12-62