Section 673.1 - Applicability(a) This part applies to any State, local governmental authority, and any other operator of a public transportation system that receives Federal financial assistance under 49 U.S.C. chapter 53.(b) This part does not apply to an operator of a public transportation system that only receives Federal financial assistance under 49 U.S.C. 5310 , 49 U.S.C. 5311 , or both 49 U.S.C. 5310 and 49 U.S.C. 5311 unless it operates a rail fixed guideway public transportation system. 83 FR 34465 , 7/19/2018; 89 FR 25738 , 5/13/2024