Such contract may also provide that such payments shall be cumulative, and that any deficiency with respect thereto shall be paid off and discharged annually out of such gross receipts before any payments by way of rental or compensation for the use of such roads shall be made to the city. The contract may provide for a readjustment at specified intervals of the part or proportion of such income, earnings or profits of the railroads, which the city shall receive, or of the portion of the amount received by the city which shall be deemed to be the rental of each such road owned by the city, and may prescribe a method of determining by arbitration or by the court the amount which the city shall receive as its part or proportion of such income, earnings or profits or as such rental upon any such readjustment thereof.
N.Y. Rapid Trans. Law § 40