Streetcar Railway Post Office

Railway post office

In the United States a railway post office, commonly abbreviated as RPO, was a railroad car that was normally operated in passenger service as a means to sort mail en route, in order to speed delivery. The RPO was staffed by highly trained Railway Mail Service postal clerks, and was off-limits to...

(RPO) routes operated in several major USA cities between the 1890s and 1920s. The final route was in Baltimore, Maryland. The Mobile Post Office Society, Affiliate 64 of the American Philatelic Society

American Philatelic Society

The American Philatelic Society is the largest nonprofit stamp collecting and organization of philately in the world, with almost 44,000 members from 110 countries...

, has published monographs detailing the operational history of each route.

These were cars that had interior fixtures similar to railway-route RPOs. One or two clerks worked in the Streetcar RPO to sort mail for post office

Post office

A post office is a facility forming part of a postal system for the posting, receipt, sorting, handling, transmission or delivery of mail.Post offices offer mail-related services such as post office boxes, postage and packaging supplies...

 stations and branches along the route, as well as connecting RPOs that served the city.

Cities with Street Railway Post Offices

• Baltimore
  Baltimore
  Baltimore is the largest independent city in the United States and the largest city and cultural center of the US state of Maryland. The city is located in central Maryland along the tidal portion of the Patapsco River, an arm of the Chesapeake Bay. Baltimore is sometimes referred to as Baltimore...
  
  
• Boston
  Boston
  Boston is the capital of and largest city in Massachusetts, and is one of the oldest cities in the United States. The largest city in New England, Boston is regarded as the unofficial "Capital of New England" for its economic and cultural impact on the entire New England region. The city proper had...
  
  
• Brooklyn
  Brooklyn
  Brooklyn is the most populous of New York City's five boroughs, with nearly 2.6 million residents, and the second-largest in area. Since 1896, Brooklyn has had the same boundaries as Kings County, which is now the most populous county in New York State and the second-most densely populated...
  
  
• Chicago
  Chicago
  Chicago is the largest city in the US state of Illinois. With nearly 2.7 million residents, it is the most populous city in the Midwestern United States and the third most populous in the US, after New York City and Los Angeles...
  
  
• Cincinnati
• Cleveland
• New York City
  New York City
  New York is the most populous city in the United States and the center of the New York Metropolitan Area, one of the most populous metropolitan areas in the world. New York exerts a significant impact upon global commerce, finance, media, art, fashion, research, technology, education, and...
  
  
• Philadelphia
• Pittsburgh
• Rochester, New York
  Rochester, New York
  Rochester is a city in Monroe County, New York, south of Lake Ontario in the United States. Known as The World's Image Centre, it was also once known as The Flour City, and more recently as The Flower City...
  
  
• St. Louis
• San Francisco
• Seattle
• Washington, D.C.
  Washington, D.C.
  Washington, D.C., formally the District of Columbia and commonly referred to as Washington, "the District", or simply D.C., is the capital of the United States. On July 16, 1790, the United States Congress approved the creation of a permanent national capital as permitted by the U.S. Constitution....