The Ozark State Zephyr, along with the Sam Houston Zephyr, was made possible by the re-equipping of the Twin Cities Zephyrs in 1936, which freed up the original two equipment sets, #9901 and #9902. The train made a single round-trip per day, departing St. Louis for Kansas City in the morning and returning in the evening. It covered the 279 miles (449 km) in 5+1/2 hours.1: 73–74 The new service was christened by Mollie Stark, daughter of Governor-elect Lloyd C. Stark, who rode the new train from St. Louis to Kansas City prior to it entering revenue service.2
The CB&Q and Alton increased the service to twice-daily in September 1938 with the addition of equipment set #9903, the Mark Twain Zephyr, which was renamed to match existing service. Contemporary advertising referred to the "Morning" and "Afternoon" Ozark State Zephyrs, mirroring the practice already adopted by the CB&Q with the Twin Cities Zephyrs. The new train operated on a reverse schedule, departing Kansas City in the morning and returning in the evening.3: 74
The CB&Q and Alton retired the Ozark State Zephyr name on April 30, 1939, with the arrival of the brand-new General Pershing Zephyr trainset. This set assumed the morning Kansas City–St. Louis round-trip, while the Mark Twain Zephyr, its original name restored, handled the morning trip from St. Louis.4: 79
See also: Twin Cities Zephyr and Mark Twain Zephyr
As originally built by the Budd Company and the Electro-Motive Company for the Twin Cities Zephyr in 1936 #9902 consisted of a power car with baggage section, a buffet-coach with seating for 40, and coach-observation car with seating for 24 in the coach section and 24 in the observation section. The Mark Twain Zephyr consisted of four cars: a power car with railway post office (RPO), a baggage car, a coach-dinette with seating for 20, and a coach-observation car with seating for 40 in the coach section and 16 in the observation section. Both sets were articulated, making it a difficult process to add and remove cars.5: 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.6: 25
Zimmermann, Karl (2004). Burlington's Zephyrs. Saint Paul, Minnesota: MBI Publishing Company. ISBN 978-0-7603-1856-0. 978-0-7603-1856-0 ↩
"Patronage Problems Passed Over by Stark Calling on Boss Tom". Southeast Missourian. December 17, 1936. https://news.google.com/newspapers?id=RoofAAAAIBAJ&sjid=z9IEAAAAIBAJ&pg=5997,1190293 ↩
Wayner, Robert J., ed. (1972). Car Names, Numbers and Consists. New York: Wayner Publications. OCLC 8848690. /wiki/OCLC_(identifier) ↩