Yes, I'd like to own all the versions!
It's a well-built engine. Great details. I'd like to make some new ground like housings and put tiny LEDs inside (porch lights too?). Maybe paint flat black the rubber suspension on the side frames of the trucks and some other detailing. I think the air hoses should have been made flexible.
I think these are heavier than the Dash 8 models. Having different drives, it would be fun to do a pull test.