N.Y. Transportation Law § 119
3. The commissioner shall have power by order to require any two or more common carriers whose lines, owned, operated, controlled or leased, form a continuous or connecting line of transportation or could be made to do so by the construction and maintenance of switch connection or interchange track at connecting point, or by transfer of property or passengers at connecting points, to establish through routes and joint rates, fares and charges for the transportation of passengers and property within the state as the commissioner may, by his order, designate; and in case such through routes and joint rates be not established by the common carriers named in any such order within the time therein specified, the commissioner shall establish just and reasonable rates, fares and charges to be charged, for such through transportation, and declare the portion thereof to which each common carrier, affected thereby shall be entitled and the manner in which the same shall be paid and secured; and the commissioner shall also have power in the same proceeding, or in a separate proceeding involving any rates, fares or charges to prescribe joint rates and fares and charges as the maximum to be exacted for the transportation by them of passengers and property within the state, and to require such common carriers affected thereby to make within a specified time an agreement between them as to the portion of such joint rates, fares or charges to which each of them shall be entitled; and in case such agreement be not so made within the time so specified the commissioner may declare by supplemental order the portion thereof to which each common carrier affected thereby shall be entitled and the manner in which the same shall be paid and secured; such supplemental order shall take effect as part of the original order from the time such supplemental order shall become effective. All powers of the commissioner to establish through routes and order joint rates, fares and charges as above conferred in relation to common carriers by railroad, shall extend and apply to the establishment of through routes and ordering of joint rates, fares and charges for use and observance by common carriers by railroad and common carriers by water. When property may be or is transported from point to point in the state of New York by rail and water, the transportation being by a common carrier or carriers, and entirely within such state, the commissioner shall have jurisdiction of such transportation and of the carriers, both by rail and by water, which may or do engage in the same, in the following particulars, in addition to the jurisdiction given by other provisions of this chapter: