49 CFR 661.1 : Transportation (§ 1.1 To Parts 1581-1699) — (§ 572.1 To Parts 851-999) — Other Regulations Relating To Transportation (Continued) (§ 572.1 To Parts 851-999) — Federal Transit Administration, Department Of Transportation (Part 600 To Parts 675-699) — Buy America Requirements (§ 661.1 To § 661.21) — Applicability.