49 CFR § 663.27
Pre-award purchaser's requirements certification
November 18, 2020
For purposes of this part, a pre-award purchaser's requirements certification is a certification a recipient keeps on file that—
(a) The rolling stock the recipient is contracting for is the same product described in the purchaser's solicitation specification; and
(b) The proposed manufacturer is a responsible manufacturer with the capability to produce a vehicle that meets the recipient's specification set forth in the recipient's solicitation.