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Here is the International Road Bridge (white) with the Railway Swing Bridge (black, opened here to allow canal traffic to pass) and the amazing red bridge, which is actually an emergency control for the canal. In 1909 it was used ... it swings across the canal in case the lock collapses (as it did then) and holds the water back by means of a series of battens that are lowered one by one from the bridge to stop the rushing water. I took a picture of the sign that explains this (better) which I will upload at some point.