The Ozark State Zephyr was a streamlined passenger train operated by the Chicago, Burlington and Quincy Railroad (CB&Q) and the Alton Railroad (the "Alton") between St. Louis and Kansas City in Missouri, home of the Ozarks.

The train made a single round-trip per day, departing St. Louis for Kansas City in the morning and returning in the evening.

The new train operated on a reverse schedule, departing Kansas City in the morning and returning in the evening.

Louis round-trip, while the Mark Twain Zephyr, its original name restored, handled the morning trip from St.

[3]: 212  The relative lack of seating in both consists, and the presence of the RPO in the Mark Twain Zephyr, reflected the CB&Q's belief that mail and express revenue was a better source of income on short-haul Midwestern services than passenger traffic.