As canal traffic increased the problem of rope wear on bridges and locks was tacked with more ingenuity.
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This cast iron rubbing strip on the Shropshire Union canal may have protected the brickwork but took some wear itself
At Bank Newton on the Leeds & Liverpool canal a timber roller was employed
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At Stone on the Trent & Mersey the wooden roller was clad in wrought iron
This technique was also employed on this lock at Kidsgrove on the Trent & Mersey
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