American Heritage® Dictionary of the English Language, Fourth Edition
- n. An assembly of gears and associated parts by which power is transmitted from an engine to a driving axle.
- n. alternative spelling of powertrain.
- n. wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed
“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].”
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