#5998 is a lightweight aluminum, round-end parlor observation car originally built for the Baltimore and Ohio Railroad. It brought up the rear of the B&O's "Royal Blue" passenger train that provided service from Washington, D.C., to Jersey City, NJ. In the early 1940s it was operated by the GM&O where it was assigned to the "Abraham Lincoln" passenger service between Chicago, IL, and St. Louis, MO. The car is 70' in length and weighs 83,200 pounds which is 10,000 pounds less than a heavyweight car made out of steel. The car is air-conditioned and equipped with restrooms. It has 32 individual seats.