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tugboat
A tugboat (tug) is a boat that maneuvers vessels by pushing or towing them. Tugs move vessels that either should not move themselves, such as ships in a crowded harbor or a narrow canal,〔("How Pygmy Tugboats Dock a Giant Liner." ) ''Popular Science Monthly'', March 1930, p. 22-23.〕 or those that cannot move by themselves, such as barges, disabled ships, log rafts, or oil platforms. Tugboats are powerful for their size and strongly built, and some are ocean-going. Some tugboats serve as icebreakers or salvage boats. Early tugboats had steam engines, but today most have diesel engines. Many tugboats have firefighting monitors, allowing them to assist in firefighting, especially in harbors.
==Types of tugboats==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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