Project Finding "Nory" (Dory + Nemo) build/custom

[Super]

I have it in my mind to add a momentary switch to auto crossing gates where I wire up some lights and the switch turns them on and off (flashing) every time a wheel rolls over it. so once the train passes the crossing the lights are off. I know there is some videos out there with switches in the blue track.

Panda NEKO No.1 has some examples of intrack momentary switches. https://www.youtube.com/user/PandaNEKONo1/videos