((a)) ** .—** At the request of the Secretary of Transportation, the Attorney General may bring a civil action in a district court of the United States—

((1)) to enjoin a violation of, or to enforce, this part, except for , or a railroad safety regulation prescribed or order issued by the Secretary;

((2)) to collect a civil penalty imposed or an amount agreed on in compromise under section 21301, 21302, or 21303 of this title; or

((3)) to enforce a subpoena, request for admissions, request for production of documents or other tangible things, or request for testimony by deposition issued by the Secretary under this part.

((b)) ** .—**

((1)) Except as provided in paragraph (2) of this subsection, a civil action under this section may be brought in the judicial district in which the violation occurred or the defendant has its principal executive office. If an action to collect a penalty is against an individual, the action also may be brought in the judicial district in which the individual resides.

((2)) A civil action to enforce a subpena issued by the Secretary or a compliance order issued under may be brought in the judicial district in which the defendant resides, does business, or is found.