This article relies largely or entirely on a single source. (February 2016)
The Westcoaster Mailster was a small three-wheeled vehicle used for mail delivery by the United States Post Office Department during the 1950s and 60s. They could haul 500 pounds of mail, including large parcels, versus the 35-pound limit of a foot carrier, and once represented one-third of the delivery vehicles used by the Post Office. The number of Mailsters in use peaked in 1966, at about 17,700.
Often known as "mail scooters", Mailsters worked best in areas with warm climates and flat terrain. The two cylinder gasoline-powered vehicle had a safe top speed of 35 miles per hour and a 7.5 horsepower engine. A Mailster could be rendered useless in just three inches of snowfall. Mail carriers often complained of frequent breakdowns ranging from clutch failure to broken front axles. If a Mailster rounded a corner too quickly, it was also prone to tipping over.
The Mailster was eventually replaced by more reliable mail delivery vehicles, such as Jeeps.
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