The Modified 1937 AAR boxcar design was a result of the industries continued search for more freight volume per carload. The real first attempt at a standardized design was the 1932 ARA steel boxcar with an inside height of 9'-4" . In 1936 the board of the AAR approved the 1937 AAR design with a 10'-0" inside height. This became a standard thoughout the industry. Although some roads had a clearance restriction on some routes, the Board once again approved an newer height car - the Modified 1937 AAR boxcar with an inside height of 10'-6". Over 25 railroads bought the Modified cars and by 1944 there were 44,600 Modified boxcars in service. The 10'-6" IH has not been exceeded to this day.
This series of Modified boxcar models by Protocraft in brass has not previously been done in O scale. Built in Korea by master builder BooRim Precision, these models closely follow the builder's drawings supplied by both the ACF museum at the St Louis Museum of Transportation and the Pullman Library at Union, IL
Correct decals are available for this car at Protocraft Decals