; and (2) by striking 2020 and inserting 2021 . 1103. Highway safety research and development Section 403(h)(2) of title 23, United States Code, is amended— (1) by striking 2020 and inserting 2021 ; and (2) by striking $21,248,000 and inserting $26,560,000 . 1104. Rail-related provisions (a) Federal funding for operating losses Section 24321 of title 49, United States Code, is amended— (1) by striking subsection (d); and (2) by redesignating subsection (e) as subsection (d). (b) Direct loans and loan guarantees Section 502(b)(3) of the Railroad Revitalization and Regulatory Reform Act of 1976 ( 45 U.S.C. 822(b)(3) ) is amended by striking September 30, 2020 and inserting September 30, 2021 . 1105. Suspension for extension period of adjustments for additional deposits into Highway Trust Fund Section 105 of title 23, United States Code, shall not apply to monies deposited into the Highway Trust Fund by this division. 1106. Prohibition on use of funds None of the funds authorized in this division or any other Act may be used to adjust apportionments for the Mass Transit Account of the Highway Trust Fund or withhold funds from apportionments for the Mass Transit Account of the Highway Trust Fund pursuant to section 9503(e)(4) of the Internal Revenue Code of 1986 in fiscal year 2021. 1107. Appalachian Regional Commission (a) Authorization of appropriations Section 14703 of title 40, United States Code, is amended— (1) in subsection (a)(5) by striking 2020 and inserting 2021 ; and (2) in subsection (c) by striking 2020 and inserting 2021 . (b) Termination Section 14704 of title 40, United States Code, is amended by striking 2020 and inserting 2021 . II Trust Funds 1201. Extension of Highway Trust Fund expenditure authority Section 9503 of the Internal Revenue Code of 1986 is amended— (1) by striking October 1, 2020 in subsections (b)(6)(B), (c)(1), and (e)(3) and inserting October 1, 2021