I've built a huge Lego train layout which is fully automated by a few Arduino's. The passenger trains ride around and after a while they stop at the station. The freight trains intersect with the track of a passenger train. A section of the track of the freight trains can be powered down: if the passenger train passes the intersection, the freight trains will stop. The trains use PWM signals to start and stop. For starting it is actually needed: otherwise the locomotive will disconnect from the wagons and drive away by itself. I've used four analog distance sensors to detect where the trains are. Since I had some Arduino's laying around, I was lazy and used three of them. That way I didn't really have to worry about race-conditions.
https://www.youtube.com/watch?v=uMceWk8m3vQ?hl=nl_NLGomez Addams would love it!
More if the trains crashed!
Good Job.
How about I post a video of
How about I post a video of all the crashes that have occurred before I had the whole thing up and running? 
I see a failure in theme
I see a failure in theme here… why aren’t the trains carrying beer kegs?
YOU!!!
You my friend, have come up with an awesome idea… Love it.
Thanks for all the comments!
Thanks for all the comments! I’m thinking about a version 2.0, with automated trackswitches and some extra trains. The problem is: I don’t have much extra space in my living room to build it! This already took me almost 2 days to set it up, make a video and put it all away again. Maybe I need to buy a bigger house with a bigger living room 
can you show us a normal speed vid on how to make it?