amounts made available under subsection (a) for the costs of management oversight of Amtrak. (c) Amtrak common benefit costs for State-supported routes For any fiscal year in which funds are made available under subsection (a)(2) in excess of the amounts authorized for fiscal year 2020 under section 11101(b) of the FAST Act (114–94), Amtrak shall use up to $400,000,000 of the excess funds to defray the share of operating costs of Amtrak’s national assets (as such term is defined in section 24320(c)(5) of title 49, United States Code) that is allocated to the State-supported services. (d) State-Supported Route Committee Of the funds made available under subsection (a)(2), the Secretary may make available up to $3,000,000 for each fiscal year for the State-Supported Route Committee established under section 24712 of title 49, United States Code. (e) Northeast Corridor Commission Of the funds made available under subsection (a)(1), the Secretary may make available up to $6,000,000 for each fiscal year for the Northeast Corridor Commission established under section 24905 of title 49, United States Code. (f) Authorization of appropriations for Amtrak Office of Inspector General There are authorized to be appropriated to the Office of Inspector General of Amtrak the following amounts: (1) For fiscal year 2021, $26,500,000. (2) For fiscal year 2022, $27,000,000. (3) For fiscal year 2023, $27,500,000. (4) For fiscal year 2024, $28,000,000. (5) For fiscal year 2025, $28,500,000. (g) Passenger rail improvement, modernization, and enhancement grants There are authorized to be appropriated to the Secretary to carry out section 22906 of title 49, United States Code, the following amounts: (1) For fiscal year 2021, $3,800,000,000. (2) For fiscal year 2022, $3,800,000,000. (3) For fiscal year 2023, $3,800,000,000. (4) For fiscal year 2024, $3,800,000,000. (5) For fiscal year 2025, $3,800,000,000. (h) Consolidated rail infrastructure and safety improvements (1) In general There are authorized to be appropriated to the Secretary