daboonk, what you've drawn is basically what my layout is, in my case the two parallel tracks are pretty long and there are several sets of crossovers. If you look at the wiring suggested by Railway Bob, you will note he connected both "north" rails to one bus and both "south" rails to the other. This makes the crossover no problem electrically. And is the way I wired mine and the way I tried to descibe in one of my earlier posts. However, the two turnback curves have to be isolated on both rails if you use this method, and each is a reverse block. I feel this is the best way to proceed. Yes, you have two reverse blocks, requiring either two reverse modules or one reverse module and the stipulation that you only enter/exit one reverse block ata time. If you don't wan the restriction of only being able to enter/exit one reverse block at a time, and don't want to buy two reverse modules, then do as David mentioned and make one reverse block as he described. If you do this, do not wire the two parallel tracks as Railway Bob suggested, wire them the same way you would have done with DC, that is, opposite polarities. This way the return curves are not reverse blocks.
Gary