The governor and council shall have a general supervision of the work, and for that purpose shall visit and inspect the same at least once in each year, and as much oftener as they may deem expedient; and they shall have power to correct abuses, remedy defects, and enforce requirements, by withholding scrip or imposing new requirements in such manner as the interest of the Commonwealth shall in their judgment require. If the governor, upon the receipt of the monthly estimates and certificates of the state engineer, shall approve thereof, he shall transmit the same and his approval thereon to the state treasurer, and the state treasurer shall thereupon deliver the amount of scrip so certified for, to the treasurer of the Troy and Greenfield Railroad Company, or to his order, subject to the provisions hereafter mentioned. If he shall not approve thereof he shall submit the same to the council, and their approval transmitted to the state treasurer as aforesaid shall authorize such delivery. SECT. 4. The company shall at least thirty days before any interest on any state scrip delivered to said company becomes payable, transmit the amount thereof, with costs of exchange, to the treasurer of the state, and he shall in all cases and at the charge of said company, pay at maturity all interest and costs of exchange which become payable on said scrip where the same is payable; and if said interest and exchange and all interest and costs thereon, or any payments required to be made into the sinking fund, or interest thereon, or any part thereof, remain unpaid when said company becomes entitled to the next delivery of state scrip, then the state treasurer shall deduct the amount so remaining unpaid, with all costs and interest thereon, from the amount of scrip then deliverable. SECT. 5. The Troy and Greenfield Railroad Company may construct their railroad across the public highways at grade, in cases where the county commissioners of the county do not determine such manner of crossing to be detrimental to the public safety and convenience; but whenever they do so determine, said company shall construct the same in such manner as the county commissioners direct. SECT. 6. The legislature shall immediately after the passage of this act, elect two directors of the Troy and Greenfield Railroad Company, to hold their office for one year, or until others are elected by the legislature; and any city, town or corporation that may subscribe not less than one hundred thousand dollars, shall have the right to elect annually one director; and any city that may subscribe not less than five hundred thousand dollars, shall have the right to elect annually by their council two directors in said company, which election may be held at any time after such subscription is made.