When it shall become necessary, in the course of the construction of the work being done by the drainage commissioners, to pass through said right of way in the manner and according to plans theretofore filed as above provided, it shall be the duty of the drainage commissioners to give notice in writing to said railroad company of its desire to cross said right of way with its construction work on some approximate date, which shall not be less than sixty days from the date of such notice. Said notice shall be served upon any agent or employee of said railroad company upon whom, under the laws of the state, service of process may be had; and the commissioners shall at the same time pay or tender to said railroad company such costs and damages as may have been adjudged against the drainage district, as hereinbefore provided. It shall thereupon be the duty of the railroad company within a reasonable time to complete such construction work across its right of way, according to the aforesaid plans and specifications under the supervision of the engineer employed by said drainage commissioners, or to permit same to be done by the drainage commissioners. Should the railroad company fail, neglect, or refuse to do and perform in good faith said work within the time fixed by said drainage commissioners for the performance thereof, or to permit same to be done, it shall be liable to the drainage district and all persons for any damage it or they may sustain by reason of such failure, and said railroad company may be compelled to perform such work by mandatory injunction issued at the instance of the drainage commissioners. This section shall not be so construed as to prohibit the drainage commissioners from acquiring such right of way by the regular eminent domain proceeding if they so elect, or as otherwise provided in this chapter.