In addition to the diner, the 1947 Olympian Hiawatha came with a cafe car called the Tip Top Grill (named after a restaurant in Chicago’s Pullman building). It was replaced in 1952 by a cafe-lounge beneath the train’s Super Domes. The menu credits M.P. Ayars as superintendent of dining car service. He took this job in January 1948, which narrows down the date the timetable only a little.
Click image to download a 1.0-MB PDF of this menu, which was provided by Brian Leiteritz.
So this menu is from around 1950 plus or minus a couple of years. An exhortation to “save food — don’t waste” suggests it is from before 1950 when people were still worried about food security.
I’d worry about food security if this was the only menu available. The table d’hôte side offered a choice of ham and cheese or cold chicken sandwich with dessert and beverage for 65¢. The a la carte side had sandwiches without the dessert and beverage for 30¢ to 45¢.