I submit for your comments, a 1:1 scale mockup of the engine-servicing area of my new On30 layout. My question, as stated, deals with a planned (?) reverse loop. You'll note that there are a few fill-in-the-blank spaces. Sorry. Here is the section without the reverse loop. Looking from the top left, the train arrives and goes through a #6 turnout, allowing the train to do one of a few things. --> 1.) Run past (or stop at) the water, sand and coal buildings, passing around behind the roundhouse, and down the return track, thus eliminating the need for reverse loop wiring. --> 2.) Run behind the water, coal and sand buildings to enter the small 3-track yard, enter the turntable, or continue on to the return track, once again, eliminating the need for reverse loop wiring. The return track will be hidden but accessable from below.