LED-lit K'Nex rollercoaster Answered
Check out this Flickr image of a long exposure LED K'Nex rollercoaster.
from the author:
Well I got a K-NEX roller coaster for Christmas, and for fun I disassembled one of the cars and mounted an LED light on it. I then set my camera to do a 15 second exposure and TA-DA!
Trainman, this is perfect for your stuff!
via Evil Mad Scientist.