Just curious but where is the southernmost point in the continental US served by railroads? I think it’s either Brownsville, Texas or Holmstead, Florida.
I believe you are correct with Homestead. Homestead is located at 25.46N Lat. while Brownsville is at 25.901N Lat.
it’d be the Florida East Coast…Jacksonville to Miami
Homestead is south of Miami on the CSX. So that would rule out the FEC.