Pub. L. 115-141, div. L, tit. IV, sec. 421 (as amended)

SEC. 421. Section 149(m) of title 23, United States Code, is amended by adding “or on a State-Supported Amtrak route with a valid cost-sharing agreement under section 209 of the Passenger Rail Investment and Improvement Act of 2008 and no current nonattainment areas under subsection (d),” after “2012,”.