Streetcar railway post office

This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help improve this article by introducing citations to additional sources. Find sources: "Streetcar railway post office" – news · newspapers · books · scholar · JSTOR (September 2016)

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 Mobile Post Office Society, Affiliate 64 of the American Philatelic Society, 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 stations and branches along the route, as well as connecting RPOs that served the city.