Which track (train) size is the most popular? When I was a kid I had a Tri-Ang trainset. I loved that trainset and the size it was. I'd quite like to build a new set without getting too excessive
but would like to start on a common track size so I can by bits on on-line auctions and not end up with a rare setup. And I don't want to get too fancy with sound, lights and switching.
Is HO and O the same size?