The new stainless steel train, built by the Budd Company, offered all room sleeping accommodations and, in addition to a full diner, offered a Vista-dome coffee shop car called the Chuckwagon. Parlor seats continued to be available in the observation car. Because of the popularity of the Denver-Chicago segment of the Vista-dome California Zephyr, the new train also carried Vista-Domes. In addition, a new all room sleeping accommodation, the slumber coach, offered private sleeping facilities, with in-room washstand and toilet, to passengers at coach fares plus a small surcharge.
These cars were revolutionary in their use of fiberglass room modules. Each train carried two and they always were sold out, even up to the beginning of Amtrak. By 1959 slumber coaches would appear on the trains of four other railroads, although three would later give them up. Between 1959 and late 1964, CB&Q’s four cars and Northern Pacific Railway’s four cars were pooled in Denver Zephyr / North Coast Limited service. The pool required tight scheduling and good timekeeping and was discontinued when NP acquired eight additional slumber coaches second-hand. Even though only 18 of these revolutionary cars were built new, they remained popular, even after the operation of rail passenger service was assumed by Amtrak, and carried passengers until the mid-1990s, when age and changes in passenger car requirements forced their retirement.





