Bus, Not Horse, Power - National Postal Museum

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Thanks for the questions Ashley. NPM Historian, Nancy Pope, answers:

Highway Post Office (HPO) buses were used from 1941-1974, although the majority of their use came in the 1950s and 1960s. Mail has been sorted en route to post offices, or sorting centers as needed through the years. The Railway Mail Service ended in 1977, which was the last transportation system also devoted to mail sortation en route.

How long were these mail sorting buses in service? And, when did the USPS stop sorting mail in-route?

Love the ad-- design from that era is always intriguing to me.

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