I am in the processing of organizing my late father's papers to contribute to a historical archive. In addition to being a skilled Lionel layout builder, my dad was a radio performer in 1930-31. (I make the joke that he was a comedian back in the days of "Silent Radio" and it takes people a moment to catch on. Silent RADIO?!?!?) Among his stuff was a box of fan mail with a postcard promoting Missouri Pacific passenger service, postmarked April 1931. I am donating the original along with the collection, but I scanned it to keep the image and share it here.
Interesting. I guess that must have been advertising a connection to California via the SP Sunset Route. The Sunshine Special was MoPac's primary St. Louis to San Antonio train. When the Texas Eagle was inaugurated it became the secondary train on that route.
It is neat to see a pre-Eagle MP advertising. I also find it interesting, as a point of reference to the era, to see the mention of "Soda Fountain Service" on the card.