The contract further provided, that, with the assent of both parties, the tunnel might be constructed for a single track, in which case no abatement was to be made for the first three thousand feet; but for the excavation beyond that point, the sum of twelve dollars per lineal foot was to be deducted from the contract price. The above are the essential provisions of the contract under which H. Haupt & Co. performed their work upon the road and tunnel until February 18, 1858, except as the same was modified and changed by votes of the directors. The contract was reported to the board of directors, and approved by them August 6, 1856. On the same day the directors voted to request the trustees to recognize H. Haupt & Co. as contractors, instead of E. W. Serrell, and to issue the bonds to said H. Haupt & Co. on the estimate of the engineer and the order of the trustees. They also voted to change the location of the road at the West End, in accordance with plans marked A and B. Under date of July 10, 1857, there appears upon the records the following:-- A preamble, "stating that the efforts to raise money for building the road had proved unsuccessful; that no payments had been made the contractors for more than a year, * * * *; that the work could only be carried on by the continued efforts * * * * and personal credit of the contractors. "Therefore voted, that the whole of the State bonds that may be issued in aid of the Troy and Greenfield Railroad Company shall be exclusively appropriated to work done, or to be done, upon the tunnel, in compliance with the terms and conditions of the Act authorizing the loan of credit, and with such other conditions and modifications as the legislature may, from time to time, make and establish; but said H. Haupt & Co. shall not be held subject to any other conditions whatever, so far as respects the work done upon the tunnel; and any State scrip that may at any time be delivered to the treasurer of the company, shall be promptly handed to the contractors; the contractors, on their part, to comply with the conditions of the present Act, and with such other conditions or modifications as may be introduced, and to have the benefit of any extension of time or increase of compensation by the State. Second. Any new or additional subscription that may be obtained, shall be applied to payment of the present contractors for work done, or to be done, by them, and to no other object; and any subscriptions that may be collected west of the Hoosac Mountain, shall be applied exclusively to the completion of that portion of the road. Third. The present subscription east of the Hoosac Mountain may be collected and applied to the payment of other liabilities of the corporation, and the treasurer is requested to prepare, without delay, a full and complete list of all such liabilities.