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It was used with Pfalzgrafenstein Castle in the middle of the Rhein and the fortified city of Kaub on the far side to provide an impenetrable toll zone for the Holy Roman Emperor until Prussia purchased the area (1866) and ended this toll in 1867.
Some, such as Pfalzgrafenstein Castle in the middle of the Rhine near Kaub, were, however, purely customs points and only collected tolls.