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track over the main channel which is always in water whatever the state of the tide. The original viaduct had this span as 38 ft and consisted of a moveable section to allow shipping through. A diagram in Rennison's book about civil engineering shows a telescopic section that retracted in one direction. It was decided against using a lifting or drawbridge, as strong winds move up the estuary from the Irish Sea, so Brunlees developed a telescopic or horizontal sliding bridge for that section. The tracks are 7.9

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