Tom,
We have 4 mainlines. When we first started we only had 2 ( Track 1 & 3) but it was hard to give everybody a chance to run so we added the 2 extra mains ( Track 2 & 4). I personally wish we had just added track 2 to allow for more scenery. On some modules track 4 will meander over to 5 and in one area track 3 and 4 meander over to 4 and 5. All corners have 5 mains because to make the layout configuration more flexible.
Our standard modules are 24 x 48. There are a few that are 28 x 48. We have also granted permission to make 24 x 24 inch modules. Scenery modules are customized to fit some places while others are made from blank standard modules.
