Another thing to consider is that if you run modern equipment at home or on a club layout where others run modern equipment. The scale 89' flats by Atlas and the 89' Auto-racks and 86' high cube boxcars by Lionel are longer than 21" passenger cars. They are closer to 24". They too will get you with height clearances too. Scale auto racks, high cube boxcar, and double stacks are tall and you will probably need 7" of clearance from the railhead.
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