Obviously I have too much time and money in 3 rail to move quickly into two rail, but I'd like to at least know what it is, in case I build another layout.
Is two rail always associated with scale size? I prefer O-27, personally.
yes, two rail is almost always associated with scale with some modelers going to the extreme of changing the slightly erroneous 1/4" to the closer 17/64th scale.
also be prepared for a layout size change, especially if you abide by true O27 running now. in scale O, a 36" radius curve (O72 equivalent) is almost the absolute minimum for a scale layout and if you want to run 4wh-coupled locomotives, or clear couplers or sideframes for a lot of rolling stock, 60-72" radius mainline curves should be considered.
if you want to stay O scale but lack the room, you might consider consider On3.
definitely consider DCC. layout wiring is much simpler, not to mention the amazing control and functioning. almost all animation tinplate offers aside from (in most cases) smoke.
cheers...gary
