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The UPU S10 standard defines a system for assigning 13-character identifiers to international postal items for the purpose of tracking and tracing them during shipping. The standard was introduced on 18 April 1996, [ 1 ] : 4 and is currently in its 12th version.
Internationally, the use of registered mail requires labels with a 13-digit reference number and corresponding barcode (UPU S10). The first two letters indicate registration (usually "RR") while the last two letters usually represent the country where the registered item was posted.
It is a unique ID number or code assigned to a package or parcel. The tracking number is typically printed on the shipping label as a bar code that can be scanned by anyone with a bar code reader or smartphone. In the United States, some of the carriers using tracking numbers include UPS, [1] FedEx, [2] and the United States Postal Service. [3]
About 700 railroads operate common carrier freight service in the United States. There are about 160,141 mi (257,722 km) of railroad track in the United States, nearly all standard gauge. Reporting marks are listed in parentheses. [1] A&R Terminal Railroad (ART) Aberdeen and Rockfish Railroad (AR) Aberdeen, Carolina and Western Railway (ACWR)
Railway Express Agency (aka REA Express) (REA), founded as the American Railway Express Agency and later renamed the American Railway Express Inc., was a national package delivery service that operated in the United States from 1918 to 1975.
As of 2023 there are just four American owned Class I freight railroad companies and one passenger railroad company (Amtrak). The list also includes two Canadian-owned Class I freight railroads, both of which have trackage in the US, and one, CPKC, has trackage in Mexico. [1] [2] Amtrak; BNSF Railway; Canadian National Railway