It shall be unlawful for any unauthorized person to place any explosive substance whatever upon the rail of any railroad, whether operated by steam, electricity or otherwise, in this State and any person who violates the provisions of this section or aids or assists therein shall be guilty of a misdemeanor and, upon conviction thereof, shall be sentenced to pay a fine of not more than one hundred dollars or to imprisonment not exceeding thirty days, in the discretion of the court or magistrate.