Our oldest daughter and her husband adopted a brother and sister this summer. The young lad is up to his ears in trains, reading everything he gets his hands on. He sees a picture and can usually spout off some info. We are thinking of some old Lionel stuff as a Christmas gift. I have a lot to learn and the first thing is the various gauges used. "N" seems to be common on e-bay. What others are we going to run into? Steamer might just know a thing or two.