As an indication of its enthusiasm for dome cars, in 1947 the Burlington completely re-equipped the Twin Cities Zephyrs with a new dome-car train. Each train consisted of a baggage-club-lounge car, four dome coaches, a diner, and a dome-parlor-observation car that included a private drawing room with five seats. For some reason, the Burlington was never interested in dome diners or dome sleepers (not that the Twin Zephyrs needed sleeping cars).

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The dome coaches seated 54 people on the main level, plus of course 24 in the dome. The bulkheads in front of the domes featured murals of historical scenes by Philadelphia artist Kathryn Fligg who, among other things, also illustrated books. The dome-parlor car was for first-class passengers and was sometimes supplemented by a flat-topped parlor car that ran between the diner and the observation car. The flat-glass domes (sometimes called pattern domes) Silver Dome and Silver Castle also sometimes were used on the Twin Zephyrs.

The new train entered service in December 1947, while the old Twin Zephyrs were bumped into duty as the Nebraska Zephyr (now often powered by an E5 locomotive instead of the original shovel-nosed locomotive) between Chicago and Omaha/Lincoln. One of these Nebraska Zephyr‘s still exists in the Illinois Railway Museum in Union, Illinois.