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a steel cable used to tow a trawl. The thickness of the cable used for the trawl line depends upon the tractive pull developed by the trawler. For example, big trawlers like the BMRT (large refrigerator and freezer trawler) need lines 26.5 mm in diameter; medium-sized trawlers like the SRT (medium freezer trawler) use lines 22.0 mm. Markers are attached to the line at 50-m intervals. The line is kept wound on windlass barrels.