Are you planning to run the two trains independent of each other? If so I think you might need to isolate the two power circuits going through the crossover. Look underneath and see if there is a metal strap connecting the middle rails of each side.
Back in the early 90s I designed a circuit board for a man in Indiana that monitored the trains on a layout with two 90 degree crossings that would prevent a collision. You have to put some insulated track sections in and lock the engines in forward direction only. I didnt know what kind of engines or current draw he would have so I used four relays to control the trains and the track power.
