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Continuing our series of videos and posts to let you #NCLearnAtHome. Railway Posts Office (RPO) cars were in use from the mid-1880s through the 1970s in the United States. At height of "mail by rail," some 9,000 train routes covered 200,000 miles in North America. With growing reliance on highway delivery and the decline of passenger rail travel, Railway Post Office cars declined with them. Check out how the clerks would use the catcher arm to pick up bags of mail, while kicking of the bags to b