This menu is about the same size and uses the same paper as the previous three, so is probably from the same late-1960s era. Unlike the breakfast and dinner blanks, this one is a four-page folder and not just a card.
That’s appropriate as the Panama Limited was IC’s premiere train, and until the end of 1967 included only Pullman cars. If, like yesterday’s menu, this one is from 1968, that would be after IC started including some coaches in the train. But it would still offer a higher level of service than, say, the City of New Orleans which, thanks to Steve Goodman’s song, is better known today but was not quite as classy.