Streetcar railway post office (RPO) routes operated in several major US cities between the 1890s and 1920s. The final route was in Baltimore, Maryland...

The United States Postal Service (USPS), also known as the Post Office, U.S. Mail, or Postal Service, is an independent agency of the executive branch...

including those now obsolete. As early as October 1831, the United States Post Office recognized common abbreviations for states and territories. However,...

In Canada and the United States, a railway post office, commonly abbreviated as RPO, was a railroad car that was normally operated in passenger service...

Until 1971, the postmaster general was the head of the Post Office Department, or simply "Post Office" until the 1820s.: 60–65  During that era, the postmaster...

suburb Streetcar Railway Post Office List of rail transit systems in the United States (current systems only; list is not limited to streetcar/tram systems)...

"To establish Post Offices and post Roads." The Post Office has the constitutional authority to designate mail routes. The Post Office is also empowered...

reliability test. Real-world testing at the Fountain Valley, California post office during July and August demonstrated the average route covered 13–16 miles...

Post was transported over water in the United States in the later nineteenth and the twentieth century. Route agents and, later, railway post office (RPO)...

Traction Company and Washington Railway and Electric Company. In 1933, a second consolidation brought all streetcars under one company, Capital Transit...