What track are you using? If you use insulated third rail this is easier done with Gargraves track as you can cut your block joints wherever needed with a Dremel cutoff wheel. Are you using straight transformer power or some sort of command system? The method that I am talking about is for straight transformer control. You need to lock the e-units in one direction. You will also have to figure out how long the stopping distance is of you locomotives so you can determine how long to make you stopping blocks. I have to think about this a bit. I am thinking you also need another relay to power the center of the crossover. I am going to have to set down and draw this thing out.
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