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Buses are powered usually by gasoline or diesel engines, but in a few cities electric motors fed from overhead wires are used. The construction of small buses is similar to that of heavy automobiles, while the construction of large buses is similar to that of heavy trucks. Some large cities now use articulated buses, which can seat more than 60 passengers; such buses are constructed in two parts and joined, or articulated, with an accordian-style sleeve.
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