Definition of "power train" []

• An assembly of gears and associated parts by which power is transmitted from an engine to a driving axle. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "We discovered that the transmissions must also be operated while the engine is idling, otherwise by a sudden start the metal parts of the power train from the engine to the drive sprockets would be damaged [because of the low viscosity of the oil at those temperatures]."