The first exterior shots of the train show it consists of single-level cars, but a shot near the end shows bi-levels.
Sleeping cars with open windows have not been used on American passenger trains since the 1930s.
The final scene ends with the the train passing a sign that says New Rochelle. New Rochelle is a town in the state of New York, 4 hours further up north from Washington D.C., the destination Carl and Steve are supposed to be going to.