Mat,
Yeah I don't recall Revel doing anything in "Auto's" in 1:87th, BUT Johnny Lightening Did as well as Maisto (spelling) as well.....
The weight of the cars doesn't matter, as the actual train car, as its a pretty big car, needs extra weight added to keep it on the track anyway.... SO, The diecast bodies doesn't hurt anything....I have a bunch bran X cars from Johnny Lightening in 1:87th but. I'd love to use Mopars in the "open" sided auto carrier train cars so they could be seen, AS those type cars were used in the days of Mopar Muscle!