36 Pa. Stat. § 3452
The said joint commission is hereby authorized and empowered to enter into leases or other contracts or agreements with one or more corporations, companies, firms, or individuals, having power to install or operate electric street passenger railways, or electric elevated or subway railways, or any other kind of electric railway, or any steam railroad, or other means of transportation, in one or both of the municipalities in which said bridge and its approaches and the plazas appurtenant thereto are located, for the installation, operation, or maintenance, by the said contracting corporation or corporations, company or companies, firm or firms, individual or individuals, of the said railway or railroad or other transportation facilities on and across said bridge for the benefit of the public; or, in its discretion, the said joint commission may itself install, maintain, use, operate, or provide for the installation, maintenance, use, and operation of the said railway, railroad, or other transportation facilities, without entering into any lease or contract with an operating corporation, company, firm, or individual for that purpose; or the said joint commission may maintain, use, and operate any part or portion of the said facilities and contract for the maintenance, use, and operation of any other part or portion thereof.
36 P.S. § 3452