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Possibly with the Walthers well car. Those stand tall if highcube containers are used.

If the NMRA clearance is 23', then there's some fudge factor built in it. Plate F+ (doublestacks) is 20' 2", most roads use 20' 5" to 20' 8" as the max clearance for Plate F+ cars

Thanks. Any chance of someone putting calipers to this combination and finding out how high it actually is, railhead to top of load? I don't have a sample to test, so the information would be appreciated.

After a bit more research, if this PDF document from Transport Canada is to be believed, then the NMRA simply converted the prototype dimension to scale, without making any allowances for modeling error.As you say, the height of the "loading gauge" (the size of the cars) tops out at 20'2". The height of the "structure gauge" (the size of the minimum clear space around the tracks), however, is 23', just like the "1:1" NMRA spec.Yet another "NMRA standard" that's really someone else's work with a label slapped on it...