later than 210 days after the enactment of this Act: Provided further , That the Secretary shall issue the Notice of Funding Opportunity that encompasses funds provided under this heading in this Act no later than 270 days after enactment of this Act and announce the selection of projects to receive awards for such funds no later than 450 days after the enactment of this Act. Restoration and enhancement For necessary expenses related to Restoration and Enhancement Grants, as authorized by section 24408 of title 49, United States Code, $2,000,000, to remain available until expended: Provided , That the Secretary may withhold up to one percent of the funds provided under this heading to fund the costs of award and project management and oversight. Northeast corridor grants to the national railroad passenger corporation To enable the Secretary of Transportation to make grants to the National Railroad Passenger Corporation for activities associated with the Northeast Corridor as authorized by section 11101(a) of the Fixing America’s Surface Transportation Act (division A of Public Law 114–94 ), $680,000,000, to remain available until expended: Provided , That the Secretary may retain up to one-half of 1 percent of the funds provided under both this heading and the National Network Grants to the National Railroad Passenger Corporation heading to fund the costs of project management and oversight of activities authorized by section 11101(c) of division A of Public Law 114–94 : Provided further , That in addition to the project management oversight funds authorized under section 11101(c) of division A of Public Law 114–94 , the Secretary may retain up to an additional $5,000,000 of the funds provided under this heading to fund expenses associated with the Northeast Corridor Commission established under section 24905 of title 49, United States Code: Provided further , That of the amounts made available under this heading and the National Network Grants to the National Railroad Passenger Corporation heading, not less