Was it the "Meteor" that ran through Iantha MO? Just to end the confusion, that line was originally built by the Kansas City, Ft. Scott and Memphis (KCFS&M) Railroad. Iantha is on the Frisco's Ash Grove Subdivision. Today on the BNSF it's know as the Ft. Scott Subdivision.
The main north/south bound trains were the "Kansas City-Florida Special" and the "Sunnyland." At the end of the passenger train era, the single train on the route was the "Southland." The "Meteor" ran on the St. Louis-Oklahoma line. Tom