19 C.F.R. Subpart D—Shipments in Transit Through the United States
Title 19 - Customs Duties
(a) From one contiguous country to another. Merchandise may be transported in transit across the United States between Canada and Mexico under the procedures set forth in part 18 of this chapter for merchandise entered for transportation and exportation. (b) From one point in a contiguous country to another through the United States. Merchandise may be transported from point to point in Canada or in Mexico through the United States in bond in accordance with the procedures set forth in §§18.20 to 18.24 of this chapter except where those procedures are modified by this subpart or subparts E for trucks transiting the United States, F for commercial traveler's samples, or G for baggage. (a) Form and number of copies required. Three copies of the transportation entry and manifest on Customs Form 7512 shall be presented upon arrival of merchandise which is to proceed under the provisions of this subpart. (b) Consolidated train manifest. When the route is such that a train will remain intact while proceeding through the United States, a consolidated train manifest containing the same information as is required on individual manifests may be used. (c) Disposition of manifest form. One copy of the manifest shall be delivered to the person in charge of the carrier to accompany the conveyance and be delivered to the Customs officer at the final port of exit.
Title 19: Customs Duties
PART 123—CUSTOMS RELATIONS WITH CANADA AND MEXICO
Subpart D—Shipments in Transit Through the United States
§ 123.31 Merchandise in transit.
§ 123.32 Manifests.
§ 123.33 [Reserved]
§ 123.34 Certain vehicle and vessel shipments.
In the following circumstances, the copy of Customs Form 7512 to be retained at the port of first arrival may be adapted for use as a combined inward foreign manifest and in-bond transportation or direct exportation entry:
(a) When all the merchandise arriving on one vehicle (except on trucks on the Canadian border) is to move in bond in the importing vehicle in a continuing movement through the United States; or
(b) When all the merchandise arriving on one vessel or on one vehicle (except on trucks on the Canadian border) is entered immediately upon arrival either under a single immediate transportation entry or a single transportation and exportation or direct exportation entry.
When Customs Form 7512 is to be used in this manner, the foreign port of lading and the name of the shipper shall be shown in every case, and a certificate in the following form shall be legibly stamped on the manifest or on a separate paper securely fastened thereto and executed by the master of the vessel or the person in charge of the vehicle:
This entry correctly covers all the merchandise on the vessel or vehicle, of which I am the master or person in charge, when it first arrived in the United States. If an error in the quantity, kind of article, or other details is discovered, I will immediately report the correct information to the port director.

