In the 1970s American Railroads were faced with boxcars of adequate size and weight becoming in short supply. There was a surplus of aging 40' boxcars. These fell out of favor with shippers during this time. Many railroads were either stretching the 40' boxcars into 50' cars or buying brand new cars built to more modern specifications. In some cases both were the case. This period became known as the "boxcar boom". This example was one of the earliest examples built by ACF for RailBox. This boxcar had a 5077 cu. ft. capacity and was a Plate "B" clearance. These cars are becoming fewer in the modern railroad scene today but still occasionally found in trains.