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.
No pain no gain. The U.S. Postal Service has reduced spending over the past decade but it has come with a downside, notably a reduction in service. Over the past decade the Postal Service has reduced labor costs by $10 billion, improved productivity, and generally reined in spending.