I'm considering doing a 4x4 this summer. I have a couple plans on paper but wanted to hear y'alls suggestions. Givens and druthers: - At least two main lines, so you can have two trains "idiot running" continuously at once. - Ability for two-train, opposite-direction operation on at least one of the mains. Basically this means having at least two separate sidings/passing tracks on one of the mains. More is okay. - Absolute bare minimum passing loop length is 4x 20m EMUs, or about 23". Preferred length is 6x 20m EMUs, or about 34". - At least one connection between the mains (crossover, etc) so I don't have to use the 0-5-0 shunter. - Some spur tracks where possible. - Minimum radius 11", prefer at least one mainline to be 12" I have no real scenery preferences at this point and figure that will just flow naturally from whatever plan is chosen. Suggestions?