As you can see, while the cars are just about the same width, the Lionel/MTH State car is considerably taller than the 1:29 Aristo-Craft car. Note that the floor lines of both cars are pretty well matched.
I can tell you from personal observation that the Aristo-Craft car is a great match for the 1:29 USA Trains J1e Hudson, but it overpowers the 1: 32 MTH J3a.
To illustrate Art's point, here's a pairing of the Aristo-Craft car with a Lionel/MTH Blue Comet coach -
The Blue Comet car sits lower on its trucks than the State car does, so the floor lines here don't match as they did in the earlier picture. Still, the wheels of both cars on the rails, so this is how they would couple if they could, and in this case the Aristo-Craft car towers over the Lionel/MTH car. I think the relationship is much like that of a contemporary Lionel 18 or 21" O scale passenger car mated with a pre-war American Flyer S Scale/O Gauge car.
You recently posted a "for sale" item as an MTH Lionel Showroom Coach. There is no way to contact you in your profile, and I'm not comfortable replying to an e-mail you just include in your post. What the **** is a showroom coach?
The so called "Showroom" coaches were basically enlarged versions of the Lionel standard gauge state cars produced by LCT to go behind the "Brute". Interior detailing was the same as the state cars. These cars had nameplates for four US cities that formerly had Lionel showrooms: New York, Connecticut, Chicago and San Francisco. These large cars ran and looked best on 84" diameter curves or larger.
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