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.