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Good point. The expression actually means "narrow-locked" canal, the width of the locks dictating the maximum width of the craft that can use them. See History of the British canal system. The majority of the British canals are "narrow" in this sense. I agree the definition is hard to find within Wikipedia. It probably belongs within the canal article and I will eventually fix it unless someone gets there before me.--Shantavira|feed me06:09, 20 June 2017 (UTC)Reply
Yes, "narrow" normally means locks 7 ft 0 in wide, with boats no more than 6 ft 10 in wide (see narrowboat). The locks at Banbury and Oxford are certainly of this order. --Redrose64 🌹 (talk) 06:53, 20 June 2017 (UTC)Reply