In order to protect the health, safety, and security of the public at locations within the boundary lines of the City of Baltimore, now or as hereafter existing, where the tracks of any railroad company cross a public street at grade, the railroad company shall install and maintain at such crossing one of the types of signaling, warning, or safety devices, in the manner, of the type, and as required under and in accordance with the provisions of § 19-3 hereof. City Code, 1976/83, art. 31, §45 Ord. 75-919