Stand clear: automatic doors.

This is brilliant!

This guy built a mechanism that opens and closes the doors on his train.
And he made it all fit inside the train without unsightly bulges!
The end of the video shows how it works. It's neat!

Once I get my Lego studio squared away, I can work on neat stuff too.
The motorized Lego Technic excavator set will help me realize some sort of nifty tracked vehicle.
Muahahahahahahaha! :D