in the "short end" and four duplex single rooms under the dome. The Wabash Railroad and Chicago, Burlington and Quincy Railroad operated dome parlor cars for first class day service. Wabash's Blue Bird included a Budd dome-parlor-observation as part of its original consist, and later added a Pullman-Standard dome-parlor car. The CB&Q operated dome-parlor-observation cars on the Twin Zephyrs, the Kansas City Zephyr and the Denver Zephyr. Several railroads operated dome observation cars, usually at the rear of the train. These cars have a dome on top of the car with a rounded-end or flat-end rear "observation" section (on the main floor) where passengers can sit and look out at the receding scenery. These cars often have additional sleeping compartments under the dome and/or in the "short end" as well as a bar and/or additional lounge spaces. The original California Zephyr, operated in part by the Chicago, Burlington and Quincy Railroad (CB&Q), referred to its car of this type as a Vista-Dome sleeper-lounge-observation, which had one drawing room and three double bedrooms as well as a dome and observation area. The Canadian Pacific Railway outfitted the 1955 Canadian with "Park"-series dome-sleeper-observations, most of which remain in service with Via Rail Canada. Variations While the partial dome cars were the most common, a number of variations on the dome car (typically called "observation" cars) were developed. In particular the full length dome car, the dome lounge car, as well as the "transition" car stand out. In the case of the former, the observation dome extended the full length of the car, with a lower level which contained a lounge or bar beneath it. This type of car was used extensively by the Atchison, Topeka & Santa Fe and Chicago, Milwaukee, St. Paul and Pacific Railroad (Milwaukee Road) railroads. In 1956, the Santa Fe introduced Hi-Level cars on its El Capitan chair car train. These were built like dome cars, with high floors along their length and a low section between their bogie trucks. The lower level contained low entrance doors and restrooms on chair cars, kitchens on diners, and a wet bar on the "Top of the Cap" lounge cars (which were the only cars of the group that could be called dome cars). Most vestibules were on the upper level. Transition cars were similar to full length chair cars, save in one regard. These cars were intended to serve as