_Second._ At least three hundred and fifty miles shall be, if possible, completed and ready for acceptance before the first day of January, 1868, provided the Union Pacific railroad company transport the material. The whole to be constructed in a good and workmanlike manner, upon the same general plan and specifications as adopted east of the one-hundredth meridian of longitude. The party of the second part shall erect all such necessary depots, machine shops, machinery, tanks, turn tables, and provide all necessary machinery and rolling stock at a cost of not less than $7,500 per mile, in cash, and shall construct all such necessary side tracks as may be required by the party of the first party, not exceeding six per cent of the length of the road constructed, and to be constructed under this contract. The kind of timber used for ties and in the bridges and in its preparation, shall be such as from time to time may be ordered or prescribed by the general agent, or the company, under the rules and regulations and standard as recommended by the secretary of the interior, of the date of February--, 1866. _Third._ Whenever one of the above named sections of the road shall be finished, to the satisfaction and the acceptance of the government commissioners, the same shall be delivered into the possession of the party of the first part, and upon such portions of the road, as well as on that part east of the one-hundredth meridian now completed, the party of the first part shall transport, without delay, all men and material to be used in construction at a price to be agreed upon by the party of the second part, his heirs, executors, administrators or assigns, and the general agent, but not less than cost to the party of the first part. _Fourth._ The party of the second part, his heirs, executors, administrators or assigns, shall have the right to enter upon all lands belonging to the company, or upon which the company may have any rights, and take therefrom any material used in the construction of the road, and may have the right to change the grade and curvature within the limits of the provisions of the act of congress for the temporary purpose of hastening the completion of the road; but the estimated cost of reducing the same to grade and curvatures, as established by the chief engineer, or as approved from time to time by the company, shall be deducted and retained by the party of the first part, until such grade and curvature is so reduced.