of obligations incurred in the Federal Public Transportation Assistance Program in this account, and for payment of obligations incurred in carrying out the provisions of 49 U.S.C. 5305 , 5307, 5310, 5311, 5312, 5314, 5318, 5329(e)(6), 5335, 5337, 5339, and 5340, as amended by the Fixing America's Surface Transportation Act, and section 20005(b) of Public Law 112–141 , and sections 3006(b) and 3028 of the Fixing America's Surface Transportation Act, $10,300,000,000, to be derived from the Mass Transit Account of the Highway Trust Fund and to remain available until expended: Provided , That funds available for the implementation or execution of programs authorized under 49 U.S.C. 5305 , 5307, 5310, 5311, 5312, 5314, 5318, 5329(e)(6), 5335, 5337, 5339, and 5340, as amended by the Fixing America's Surface Transportation Act, and section 20005(b) of Public Law 112–141 , and sections 3006(b) and 3028 of the Fixing America's Surface Transportation Act, shall not exceed total obligations of $9,733,353,407 in fiscal year 2018: Provided further , That the Federal share of the cost of activities carried out under section 5312 shall not exceed 80 percent, except that if there is substantial public interest or benefit, the Secretary may approve a greater Federal share. Capital investment grants For necessary expenses to carry out 49 U.S.C. 5309 and section 3005(b) of the FAST Act, $2,132,910,000 to remain available until September 30, 2021: Provided , That $8,900,000 in New Starts recoveries from prior year obligations from fiscal years 2000 to 2015 and $5,500,000 in Bus and Bus Facilities recoveries from prior year obligations from fiscal years 2000 to 2005 shall remain available until September 30, 2021 to carry out 49 U.S.C. 5309: Provided further , That of the amounts made available in the previous provisos, $1,007,910,000 shall be available for payments on previously executed New Starts full funding grant agreements, $454,000,000 shall be available for new New Starts full funding grant agreements, $200,000,000 shall be