American Car and Foundry built #750 as a lightweight parlor-observation car largely of riveted aluminum, with some low-alloy, high-tensile steel. It seated 26 first-class passengers in individual reclining and rotating parlor seats, six in the observation lounge at its streamlined end, which was equipped with a radio, clock, and speedometer, and five in an enclosed stateroom with a private toilet. The car was 84'6" long, 10' wide, and 13'6" high above the rail. Its empty weight was 101,760 pounds, about 9,500 pounds lighter than a car built entirely of low-alloy, high-tensile steel and about 40% less than a car of conventional heavy steel construction. Raymond Loewy designed its styling, including its colors and the sculpted eagle at the rear. It ran in The Eagle, later renamed the Missouri River Eagle, one of a pair of daytime streamliners between St. Louis and Omaha via Kansas City. It was often used by President Truman because the trains passed through his hometown of Independence, Missouri, at midday in both directions, and the Missouri Pacific was the logical route to St. Louis and, through connections, to Washington, D.C. The Truman family used the staterooms on these cars so often that they became known as the Truman Rooms.