The American Royal Zephyr made its inaugural run on February 1, 1953, as an all-new overnight streamliner between Chicago and Kansas City. The new train was prompted by the completion the previous October of the $16-million "Kansas City Shortcut", 49 miles of new track that made the route shorter, flatter, and straighter. The new alignment shaved 2 hours off of the previous shortest route, and made CB&Q optimistic that it could compete successfully against its entrenched rival, the AT&SF, on this busy route.
American Royal Zephyr #56 departed Kansas City at 10:00 pm, arriving in Chicago at 7:30 am. Westbound counterpart #55 operated on a mirrored schedule, departing the Windy City at 10:00 pm and arriving in Kansas City at 7:30 am. Both trains covered the 466 mile route at an average pace of 49 mph. The original consist included two Vista-Domes (which provided meal service), two Chicago-KC sleepers, one Chicago - St. Joe sleeper, and coaches. The CB&Q simultaneously launched a daylight Chicago-Kansas City service on the same route under the banner of the Kansas City Zephyr. Like its daylight counterpart, the American Royal Zephyr never lived up to ridership expectations, and it was not long before equipment from the ARZ was being shuffled off to other trains. Intense competition came from the Santa Fe, which ran six daily streamliners in each direction through Kansas City on a shorter schedule than CB&Q, and an existing, dedicated overnight service called the Kansas City Chief.
The American Royal Zephyr was discontinued in 1971.
