C is for Crane............
This barge and crane were sitting pretty close to the side of the river, so I would guess it was being used to dredge the bottom.
It was early afternoon when I took this image, and it was idle with no one around it.
It would have been really interesting to see it in action.
If you look to the extreme right of the photo, you can see a couple more cranes across the river.
A busy port to be sure!
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