Any railroad company may charge in accordance with the approved tariff on file with the Board of Public Utility Commissioners for the transportation of the following property any rate not exceeding twice the rate such company is allowed to charge for transporting ordinary goods by their respective charters or the law of this State:
Any railroad company may receive from any express or transportation company, person or firm any amount that such company, person or firm shall agree to pay for carrying express goods or other property; any limit to the rate of compensation in the charters of such railroad companies or otherwise to the contrary notwithstanding.
Nothing in this section shall exonerate any railroad company from carrying goods other than of the kind above mentioned that shall be offered to their agents for transportation on the terms prescribed by their respective charters or by the laws of this State.
N.J.S. § 48:12-121