Section 35U. There shall be established and set up on the books of the commonwealth a separate fund to be known as the MBTA Infrastructure Renovation Fund for the purpose of supplementing amounts available to the Massachusetts Bay Transportation Authority for infrastructure improvements. There shall be credited to said fund amounts appropriated to or otherwise transferred to said fund and any interest earned thereon which shall be made available by the state treasurer to said authority without further appropriation. The monies shall be expended exclusively by said authority for the costs of design, acquisition, renovation, construction, reconstruction, and other improvements necessary for public safety and convenience. The monies shall be expended exclusively on improvements to facilities and transit lines not included in the five-year capital spending plan of the authority in effect on July 1, 2000 including, but not limited to, platform reconstruction, efforts to ensure compliance with the American with Disabilities Act, elevators, escalators, waterproofing, fare gates, signage, lighting and other major structural improvements, but shall not be expended for operating and maintenance costs nor for the acquisition of rolling stock.