In my younger years I had S gauge for awhile then went to H O. I got out of the hobby for 15 plus years. A few years ago I bought a used O gauge set at a yard sale, Lionel 0-4-0. It was a cheap plastic engine, I put together the track to see if the engine worked. The engine ran fine, I was greatly surprised to hear locomotive sound along with decent smoke. This was new to me, I was hooked!! Because of new electronics I invested in a operating O gauge layout running Lionel Legacy system.
Bob