Any public or private railroad availing itself of the privileges of Code Section 46-8-104 shall be subject to such restrictions, liabilities, and penalties as to crossings, and shall be governed by such rules as to crossings, as are provided by law for chartered railroads, provided that where any tram or unchartered road crosses a chartered road, that the company owning or operating the tram or unchartered road may be required to put in the necessary and proper safety switches and signal service on both sides of the chartered road.