Amtrak introduced its Superliner fleet in 1979, initially operating them on Midwest corridor trains in break-in service.
The first long-distance train to be permanently assigned Superliners was the Empire Builder in October of that year.
The plan was for Superliner equipment to be assigned to western trains and that has pretty much been the case. The City of New Orleans and Capitol Limited would later receive Superliners and they ran for a time on the Cardinal.
Of course, Superliners also run on the Auto Train, so they are hardly strangers to the eastern United States.
My first trip in a Superliner was in June 1979 on the Shawnee. I rode to Carbondale, Illinois, from Mattoon, Illinois.
Shown are Superliners on the Capitol Limited in Brady Lake, Ohio. I don’t know how many years the Superliner fleet can last, but it better be for a while.