In November, 1934, Burlington put the first Diesel-powered streamliner to work between Kansas City and Lincoln. With the addition of several more zephyrs in 1935, the railroad renamed the original the Pioneer Zephyr in November, 1936. So this menu card must be from 1935, 1936, or, possibly, late 1934.
The menu offers hamburgers, hot dogs, lemonade, and orangeade for 20 cents each–about $3.50 in today’s dollars. Colas are not yet ubiquitous, but the menu offers beer, whiskey, gin, and brandy.