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Is there any way to "connect" the train tracks to an electrical device? For example, you explained earlier about connecting a waypoint for tracks to the same waypoint as a moving platform. But what if, for example, I wanted doors to open when a train goes over a certain part of the track? Basically, something that would make the track act as a switch or pressure plate or something like that.

There is currently no way to connect train tracks to an electrical device. You can use devices like a switch while riding a train track, but you'd have to have the player manually flip it while riding. The other option would be to try placing a pressure plate near where the player might ride, but I don't think they would be over the pressure plate long enough to fully open a door. I'll have to think on that one. 

I do have plans for speed boosts and brake sections for the train tracks; maybe there could be like a switch type track that electrifies whatever it's connected to. A better option might be a laser "trip wire" type thing where whenever a player crosses it acts as a switch of sorts. Then you could just have that where the player will cross it, and I think that would cover your use case?