RAILROAD TRACK MAINTENANCE CREDIT.

SEC. 112. RAILROAD TRACK MAINTENANCE CREDIT. (a) In General.—Section 45G(f) is amended by striking “January 1, 2018” and inserting “January 1, 2023”. (b) [26 U.S.C. 45G note] Safe Harbor Assignments.—Any assignment, including related expenditures paid or incurred, under section 45G(b)(2) of the Internal Revenue Code of 1986 for a taxable year beginning on or after January 1, 2018, and ending before January 1, 2020, shall be treated as effective as of the close of such taxable year if made pursuant to a written agreement entered into no later than 90 days following the date of the enactment of this Act. (c) [26 U.S.C. 45G note] Effective Date.—The amendment made by this section shall apply to expenditures paid or incurred during taxable years beginning after December 31, 2017.