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pneumatic-tube system. While the Washington route lasted for several years, that system was also eventually shut down.In 1899, a similar service, called the %u201c E x p e r i m e n t a l Postal Wagon Service,%u201d was inaugurated to evaluate its feasibility in rural areas. This wagon, also pulled by two horses, covered a 30-mile route near Westminster, MD. No mail was sorted en route, but the mail was stamped with a special postmark. Despite being very successful, and being expanded to additional routes, this service was terminated in 1904.In the early decades of the twentieth century, additional experimental mail services were run in Milwaukee, Washington, Chicago, New Jersey, West Virginia, and Maine%u2014using motorized trucks in which mail could be cancelled and sorted. None lasted more than a few years.Railway Post OfficesThe Railway Post Office (RPO) system was much more successful than the postal wagons or trucks. It first began 1832, but it wasn%u2019t until the Civil War that RPOs began crisscrossing the nation on a regular basis. As the trains rolled down the tracks, the clerks cancelled and sorted the mail, and used a system of mail cranes to exchange mailbags at stations without stopping. A clerk would use a catcher arm to snatch the incoming mailbag from a Postal wagon cancellation.Railway Post Office car of the Indiana Railroad.