After a fall hiatus, work on the Ghost Train has resumed. For the display to be effective, it needs a shock element. I want the invisible train's headlight to briefly appear while an airhorn sounds very near the trick-or-treaters. However, my yard has nothing behind which to hide a light, so I'm tinkering with the idea of putting it behind a "No Trespassing" sign that straddles the faux abandoned railroad tracks. I'll use Light-o-Rama software to synchronize the appearance of the light from behind the sign as an air horn sounds. I'm also planning to have a burst of fog around the light as it passes through the sign. This video shows my initial attempt to create a mechanism combining the light with the sign. I'll update after I get a pneumatic cylinder to move the light and figure out how to trigger a fog machine with the Light-o-Rama software.