PW/conventional operator so that means Lionel and that’s the vast majority of my trains.
However, I do have rolling stock from Lionel, MTH, and Kline. I also dipped into the Menard’s pool with some of their rolling stock. All was good for several orders but I hit a bad streak where my last four orders arrived with all sorts of problems with the trucks. I stopped buying Menards but maybe will re-visit.
Lastly, I own a handful of Williams diesel locos. Really enjoy them especially some of the great items they made years ago from the Golden Memories series.