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What is a Transportation Reference Number?
The TRN is a reservation number assigned by the carrier to hold space on the carrier for cargo being shipped. The TRN is also known as the booking number for vessel shipments; the master air waybill number for air shipments; the bill of lading number for rail shipments
Foreign Trade Division, U.S. Census Bureau
http://www.census.gov/foreign-trade/aes/index.html
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