The exercise of the powers granted by this article will be in all respects for the benefit of the people of the Commonwealth, for the increase of their commerce and prosperity, and for the improvement of their health and living conditions, and as the operation and maintenance of rail facilities by the Authority and the undertaking of activities in the furtherance of the purposes of the Authority will constitute the performance of the essential governmental functions, the Authority shall not be required to pay any taxes or assessments upon any rail facilities or any property acquired or used by the Authority under the provisions of this article or upon the income therefrom, including sales and use taxes on the tangible personal property used in the operations of the Authority. The exemption hereby granted shall not be construed to extend to persons conducting on the premises of any rail facility businesses for which local or state taxes would otherwise be required.