I recently acquired one as well. I found the comment about the alternate flashing taillights interesting, I didn't know that. That wouldn't be that hard to build in.
I've often had the same thought, but since I don't own an Aerotrain, nothing's ever come of it. Hmmm... Maybe I should start looking for one...
In any case, I took some photos with Dad's Brownie box camera that day. I can't find any others at the moment, but here's my shot of the Aerotrain departing. It's not the world's greatest picture (at eight years old, I still had a lot to learn about photography), but if you zoom in, you can just barely see that I caught the alternating lights in mid-cycle, with one light still dark.