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Here's Moloco's Milwaukee car with the off-set door.
Since all of the pictures seem to be offset to the right, I assume both sides are the same, rather than the doors being across from each other. That's weird. The Canstock cars I can understand, it makes loading with a forklift more efficient. But these don't seem to be enough off-center to make a difference, unless maybe they're designed to get an even number of standardized pallets, boxes, or whatever on the long side. Maybe the center door required leaving an empty space, or partially blocking the door. I wonder if all of these cars are offset by the same amount?
B&O literature confirms some of what has been said on this thread about the advantages of using offset doors and side fillers.A B&O document done up for shippers in the 1960s explained that, if standard pallets (40" by 48") were being used in cars with side fillers, extra pallets could be loaded in 50' cars with staggered doors. Now side fillers were 40" wide to match the pallet width. Also, side fillers could be extended to several positions with most able to create a minimum interior width of 8'4"--the width of two pallets. The document added that, on then newer B&O box cars (circa 1968) "the side fillers nearest the doors will move laterally along the length of the car about 18 inches to correct irregular pallet patterns or package overhang." According to the document, there were three categories of 50' cars with side fillers on the B&O.1) You could load 20 standard pallets in a typical 50' box car with centered 10'6" door openings. Five side fillers could be used per wall (four "walls" per car, two on each side of the door opening.)2) You could load 24 standard pallets in a car with side fillers and 10'6" door openings if the doors were each offset 23" from center. Six side fillers could be used per wall. The B&O called such cars "GMA cars," which I believe stood for Grocery Manufacturers' Association.3) Finally, the B&O had some cars, 4650 cu. ft. leased FGEX cars I believe, that had 12'2" doors that were offset 5'4" so that the door openings did not overlap at all. These staggered-door cars could hold 28 standard pallets because the entire interior of the car could be loaded, unlike the situation with GMA and standard cars. Seven side fillers could be used per wall and virtually the entire car was filled. Interesting.