This blotter bragged that Illinois Central’s three daily trains between Chicago and St. Louis were all “air-cooled.” Note that only the Daylight is “mechanically air-cooled” while the other two trains are merely “pre-cooled.” Good luck in staying cool on the Michigan Boulevard all the way to St. Louis on a hot summer evening. The blotter doesn’t have a specific date, but it mentions that Chicago’s 1933 World’s Fair is “now under construction,” so I infer it is from 1932 or, perhaps, early 1933.
The next blotter urges residents of Sioux Falls to take the Hawkeye “direct to Chicago World’s Fair.” Though there is no date, the World’s Fair began in 1933 so presumably the blotter is from that year.
Finally, we have a World’s Fair blotter that is clearly from 1934. It doesn’t advertise a specific train, but mentions the “Illinois Central electric.” IC electrified its Chicago-area commuter trains in 1926, which presumably saved the railroad some money while it relieved the city of some of its coal-fired air pollution. These electric trains continue to operate as a part of Metra, Chicago’s suburban commuter rail agency.