That H. Haupt & Co. should comply with all the conditions of the Act, approved April 5th, 1854, whereby a loan of credit was given by the State of Massachusetts in aid of the construction of the Hoosac Tunnel, and should have the benefit of any changes that may hereafter be obtained, or extensions of time that may be granted; but they shall be subject to no other conditions or restrictions other than those expressed in this contract. That the road shall be so constructed that its gradients should not exceed those in each direction which exist or may hereafter exist permanently on other portions of the line between Troy and Boston; that sharper curves than were in ordinary use in other parts of the line were to be changed at the expense of the contractors, and trestle work or temporary bridging was to be replaced by permanent structures at the expense of the contractors as soon as practicable after the completion and opening of the whole line. That H. Haupt & Co. should have the benefit of all existing subscriptions, and of all they might procure; also of any revenue that might arise from the use of the road, or any portion of it when completed, until their claims on the company were discharged and paid; and to secure this end, the payment of all other debts of the corporation was to be deferred until that of the contractors was satisfied. The real estate of the corporation not required for the purposes and use of the road, was to be sold or applied to meet present liabilities of the company; and Haupt & Co. were to maintain the organization of the corporation and pay its necessary printing expenses, by paying to the treasurer annually a sum not less than five hundred dollars. The State bonds were to be appropriated exclusively to the construction of the tunnel. The State scrip delivered to the treasurer of the company was to be promptly handed to the contractors. The compensation to be allowed to H. Haupt & Co. was to be as provided in the resolutions of the directors, passed July 10, 1857. The payment for graduation, bridging, masonry, and superstructure on the road, exclusive of the tunnel, was fixed at two million dollars, exclusive of any payments that might be made for the right of way. Of this amount, nine hundred thousand dollars was to be paid in mortgage bonds of the company; the balance in cash, to as great an extent as cash subscriptions could be secured; the remainder in stock at par. The bonds and stock of the company to be issued to H. Haupt & Co. when required, to an amount equal to the work done, estimating it by the proportion it bore to the whole amount performed and to be performed. H. Haupt & Co. were authorized to collect subscriptions to the capital stock of the company, and their receipt for money was to be accepted by the company as evidence of payment. By the execution of this agreement all former contracts between the same parties were agreed to be annulled and cancelled.