"City of Miami, "Dixie Flagler" & "South Wind". - Classic Trains Magazine

Until the C&EI and L&N dropped out in 1957 (after renaming the train Dixieland in 1954) each train operated every third day, with the days of operation printed in the Official Guide listings for two months at a time.  After 1957 the remaining two trains operated on an every other day schedule, again with days of operation listed in the Official Guide.  The every other day pattern remained until May 1, 1971 when the South Wind became daily under Amtrak, with through service restored via Lafayette.  Penn Central had dropped through service via Logansport in 1970, running a coach-only train on the South Wind's schedule to connect with the South Wind in Louisville.

There were daily secondary trains on each route well into the 1960s, into 1970 in the case of IC's Seminole.

 The SEMINOLE made it until June of 1969 but I do not recall any secondary trains trains on the SOUTHWIND route in the 1960s.