Pana is on the "Amish Country" Reroute that the Eagles take between Chicago and St. Louis during trackwork on the regular route for the Lincoln Service Trains ( which become bustitutions) and the Eagles.
It's the Texas Eagle detouring on UP's former Chicago and Eastern Illinois route between Chicago and St. Louis due to work on the regular Chicago-St. Louis UP ex-Gulf, Mobile and Ohio line. That route is slowly being upgraded to a higher speed line.