1) Have more than enough locomotives and rolling stock. All good and all scale-sized. I have only one small postwar engine that I bought just to have an authentic Lionel piece that was "Made in USA," as were the trains I had as a youngster in the 1950s.
2) Actively run about 25 engines - several older MTH PS1, mostly newer MTH, also a few each Atlas, Sunset, Lionel. I run a few large electric locomotives but prefer mostly small to medium-sized steam and diesels.
3) Never sell anything. I like everything that I bought. Why sell it for a lower price? Makes no sense to replace it with a more expensive new one of the same prototype - even if the new model sounds are a little better, has command control or whistle steam...
MELGAR