Here is a run-down of major midwest-Florida routes, as they would have been in the mid 50's.
1.South Wind(later re-namd Floridian under Amtrak, though Amtrak called it South WInd at first), Chicago, Indianapollis ,Louisville,Nashville, Birmingham, Montgomery,Jacksonville ,Miami(later west coast as well)
2.Dixie Flagler(re-named Dixieland in 1954) , Dixie Flyer, etc, Chicago, Evansville, Ind., Nashville,Chattanooga,Atlanta,Jacksonville ,Miami, west coast connections
3.City of Miami,Seminole, same route as today's City of New Orleans as far as Fulton,Ky, then BIrmingham,Columbus, Ga., Jacksonville, Miami, later west coast as well.
4.Royal Palm, New Royal Palm, Ponce de Leon, Various Great Lakes cities, like Detroit, Cleveland,Buffalo,Chicago converged in Cinncinati and went to Chattanooga, Atlanta, Macon, Jacksonville, Miami, west coast connections.
5.Flamingo, Southland, Great lakes cities as above in #4, converge in Cincinnati to Knoxville, Atlanta, Albany, west coast Florida primarily , east coast connections.
6.Kansas City Florida Special, Sunnyland, .Kansas City, Springfield, Mo., Memphis, BIrmingham,Atlanta, Jacksonville, Miami, west coast connections.
The speedster streamliners from the above list would be the South Wind, the Dixie Flagler(later re-named Dixieland) and the City of Miami, about 31 hours CHI to Miami. ALso a speedster was the Detroit Miami wing of the New Royal Palm(a winter season only train)
The Dixieland (former Dixie Flagler) was discontinued in late 1957. followed shortly by the Southland, the first two major casualties of the formerly vast midwest-Florida network. When the Southland was dropped, cars to Tampa Sarasota and St Pete were added to the City of Miami and the South Wind.
But BTW, these trains were not all daily, The South Wind, Dixie Flagler and City of Miami for years(from about 1940) operated every third day in rotation with each other. In later years the Wind and the City started operating more frequently. When the Dixieland was gone by late 1957 they became totally every other day in rotation with each other.