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Original Text (Annotation: EPW036418 / 321625)
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Dock cranes often straddled the railway line closest to the quayside. This allowed a greater reach for the crane over the ship, as well bring the loaded wagons as close as possible. The four legs of the crane ran on their own wheels, often set in bogies, along an outside pair of rails, with the railway line running down the middle. The 'arch' of the crane was large enough for all types of railway wagons and engines to pass through. Many of this type of crane were power by electricity and had a cable on a drum which was paid in and out as the crane moved along the quay. '
