towboat
A self-propelled vessel which moves other, usually non-self-propelled vessels. May be in the form of a pushboat, a square- or flat-bow boat designed to rigidly connect to a barge or barges for the purpose of pushing it or them along a waterway. Not quite the same as a tugboat, which usually assists ships.
There's a towboat pushing 25 barges up the Mississippi River.
towboat by Wandelndes Lexikon January 5, 2005
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