So measured the room my current table is in, to figure out what my final expansion would look like. The room is 11x14 with two doors (one 3', the other 5') on the long walls. Realistically a bit more than half the room is available for a layout. Attached is a schematic, with the green shaded area what is available to build. My goal -if possible- is to have three trains in continuous motion on loops (two on a main level, one on a raised level*). Also to have a modest switchyard if possible for storing rolling stock as well as for breaking up the monotony of circular running. Is that possible with this space?
*I should also mention that on the longer table, I plan to build a subway underneath the table, and have a station on the other side that shuttles people back and forth. I would have a reversing loop on the subway, but I'd need to build a ramp on the other table (I figured along the wall so it's out of the way) which will eat up some space.