The term "transportation company" shall mean and include every person not engaged solely in interstate commerce or business that now or may hereafter own, operate, lease, manage or control, as common carriers or for hire: Any railroad or part of a railroad in this state or any cars or other equipment used thereon, or bridges, terminals or sidetracks used in connection therewith, whether owned by such railroad or otherwise; any express companies; any car companies; any sleeping car companies; any steamboat or steam packet company or common carrier for hire by water regardless of the propelling power used; any railroad depot or terminal station; any telegraph line; any telephone line; any pipeline for the transportation of oil or other commodity, whether the transportation is by pipeline or partly by pipeline and partly by rail, truck or water. This term shall also mean and include two or more transportation companies rendering joint service. Such term shall also mean and include every person not engaged solely in interstate commerce or business that now or may hereafter own, operate, lease, manage or control as a means of common carrier transportation by himself, or by others; any canal or other artificial watercourse, or part thereof, in this state, or any public wharf, dock, or terminal used in connection therewith, whether owned by the person who owns such canal or other artificial watercourse, or otherwise, provided nothing in this chapter shall apply to the regulation of commerce on navigable streams or rivers, whether the streams or rivers contain locks and dams or not.