246. A tow of 9 barges is made up three abreast by three long. The towboat is faced up to the last barge of the center string. What is the name of the outer two strings of barges?

The two outer strings of barges are formally called 'drag strings' when the towboat is aligned with the center string, reflecting their tendency to lag during maneuvers; this is the correct terminology in inland towing practice.