Mich. Comp. Laws § 462.357
The owner of a locomotive engine or the person in charge or in control of a locomotive engine, or a person acting as a conductor of any train of cars, shall not knowingly authorize or knowingly permit the locomotive engine to be operated upon the railroad tracks of this state by a person who is impaired by or under the influence of alcoholic liquor or a controlled substance, or a combination of alcoholic liquor and a controlled substance or who has an alcohol content of 0.04 grams or more per 100 milliliters of blood, per 210 liters of breath, or per 67 milliliters of urine. A person who violates this section is guilty of a misdemeanor, punishable by imprisonment for not more than 93 days, or a fine of not less than $100.00 nor more than $500.00, or both, together with costs of the prosecution.
MCL 462.357