What is "mainstreeter"

The Mainstreeter was a passenger train on the Northern Pacific Railway between Chicago, Illinois, and the Pacific Northwest from 1952 to 1971. When the North Coast Limited got a faster schedule in November 1952 the Mainstreeter was introduced, running roughly on the North Coast's old schedule but via Helena. Unlike the North Coast the Mainstreeter was not a true streamliner as it carried both new lightweight and traditional heavyweight coaches. It replaced another train, the Alaskan. The name referred to the Northern Pacific's slogan, "Main Street of the Northwest." While Amtrak did not retain the train as part of its initial route structure, it created a new train named the North Coast Hiawatha several months afterwards. This train ran until 1979.