I'm watching the see-saw myth with the girl getting launched by the skydiver... they're working at the Mare Island Naval Station... and looking around, came across this unique cantilever setup on Streetview! I wonder if the line gets any use anymore...
EDIT:
Hmm... there are setups picture a block or two away from here that look brand new... but follow the line a mile or so further, and all the crossings have had the gates removed.
