Mich. Comp. Laws § 91.6
The council may provide for and change the location and grade of street crossings of any railroad track; compel any railroad company or street railway company to raise or lower its railroad track to conform to street grades which may be established by the city; construct street crossings in a manner and with the protection to persons crossing at those crossings as the council may require and to keep those crossings in repair; and require and compel railroad companies to keep flagmen or watchmen at all railroad crossings of streets and to give warning of the approach and passage of trains at those crossings and to light those crossings during the night. On and after the effective date of a passenger railroad maximum speed limit specified in a final order of the director of the state transportation department, an ordinance of a city prescribing the maximum speed limit of locomotives used in passenger train operations or of passenger railroad trains shall not be enforceable as to a speed limit other than the limit set forth in the order.
MCL 91.6