Climbing aboard is an amazing spectrum of passengers. There’s Darwin Rinehart, a once great Hollywood producer whose most recent movie was a total flop and who now faces bankruptcy and shame. In a dark recess of a train car hides a mysterious, disheveled, sickly man who has not paid for a ticket, smuggled inside by an unscrupulous porter. Millionaire Otto Wheeler arrives in a wheelchair; deathly ill, he knows that this will be his last trip on the great train. Clark Gable causes a stir when he steps aboard, and though he’s ridden these rails for years, indulging in booze and women with equal fervor, those around him sense that this time, something is different. And finally there’s former President Harry Truman, distinguished, congenial, and constantly accompanied, for his protection, by a railroad detective.