Which gates are you using?
I see the logic has having two triggers (IR device) When the train approaches the crossing and triggers the first it will then proceed and trigger the second. When it clears the first, the second will be activated until the train clears that one. That shouldn't be too bad and seems the simplest way to wire.
You'll have to wire the triggers differently if you want to isolate the triggers.
let's discuss the equipment that you have and how you would like it to operate.
