66 Pa. C.S. § 2301
Every common carrier shall furnish a reasonably sufficient number of safe facilities, and run and operate the same with such motive power as may reasonably be required, in the transportation of all such passengers or property as may seek, or be offered to it, for such transportation, and shall operate its facilities with sufficient frequency, at such reasonable and proper times, and to and from such stations or points, as the commission, having regard to the accommodation, convenience, and safety of the public, may require; and, when required by the commission, shall change the time schedule for the operation of its facilities, and, generally, shall make any other arrangements and improvements in its service which the commission may require. If, at any particular time, a common carrier may not have sufficient facilities to meet the requirements for the transportation of property, then it shall lawfully distribute all available facilities among the several applicants therefor without discrimination between shippers, localities, or competitive or noncompetitive points, in accordance with such regulations as the commission may prescribe. Such regulations, in the case of common carriers also engaged in interstate commerce, shall conform so far as practicable to those prescribed by any Federal regulatory body on the subject. Preference may always be given in the supply of facilities for transportation of fuel, livestock, or perishable matter.
66 Pa.C.S. § 2301