Over the last month I've been trying to nail down the scale I would proceed to work in at home. After giving much consideration I think I've decided on S scale for this. However, during my journey I've encountered O27 which at first appearance looks extremely close to S scale. Can anyone discuss the differences between O27 and S scale for me? As far as I know Lionel and Marx were the main legacy proponents of O27. Were their any other manufacturers? Also is MTH's "RailKing" lineup the only modern source of brand new O27 product? Unless I'm mistaken Lionel hasn't touched O27 in a while.