Specifically, page 25 of the DCC wiring presentation on the above link shows how to handle double track crossovers. What it does not show is that each of the double tracks must be wired the same polaity. In DC, we are used to having these two tracks wired opposite, which is why crossovers can create problems. In DCC, instead of + and minus, the polarities are referred to as 1 and 2, at least in the instructions I have from Tony's for their circuit breakers and reverse modules. For both of the double track north rails, they should be rail 1, both south rails rail 2. Then the crossover does not create a reverse block, the reverse block will be the loop at the end, as shown.