I have a small amount purchased in the 80's before I switched to Lionel and O. Marklin is a masterpiece. First I am surprised they went bankrupt. Do people not appreciate these magnificent works of model art anymore? Video games and big box store toys are in the trash after 5 years.
I assume Marklin is still A/C 3 rail? Does Marklin still make the tinplate US style rolling stock?
Marklin still does, occasionally, make the tinplate US style rolling stock. When they make it, I buy it. Their plastic freight cars, though nice are pricey. I have a few of the plastic US freight car sets, the first ones manufactured but haven't bought any since. And for you Great Northern fans, they are doing a set of F7 AA units this year, orange and green paint scheme. Their "command control" system works well, but they seem to keep changing it. However previously issued items continue to work with the new stuff.
Finally, I have no vested interest in Marklin. They make a good product which is why I buy their stuff.
Steve