The railroad and road swings back. This is the old road before the new bridge was built, but the railroad still uses the track, so they can't just take it out.
The gates of the lock swing open. That is so amazing to see such large gates open up!
The gates begin to open. They swing back into an indentation that allows the barge to float through freely.
The front of the barge starts to move through the gates. At first, it looked like it only had about one foot clearance on each side, but upon closer examination, it had a whole three feet on each side.
Finally, the tug comes through. It's amazing how much smaller it looks out in the middle of the river as opposed to standing on top of it.