The U.S. Postal Service has a long and storied history of moving mail on rail dating from the beginning of the railroad industry in the early 1800s. Mail was sorted on trains and Post Offices and processing facilities were located near rail stations. Many innovations and changes to rail, including the very development of modern freight rail service, were closely tied to the movement of mail. Today, however, the Postal Service meets its surface transportation needs almost entirely by using trucks owned by highway contractors.
U.S. Postal Service Mail Transport Equipment (MTE) consists of specialized containers such as sacks, pouches, trays, hampers, over-the-road containers and pallets. Although the Postal Service does not maintain a perpetual inventory of its MTE, a 2010 audit indicated approximately 359 million pieces in the system of 400 processing facilities, over 30,000 post offices and thousands of mailers nationwide. Proper MTE management and availability ensure the safe, secure, and timely movement of mail between Postal Service facilities and its customers or contractors