driving-wheel

driving wheel

noun
1.
Machinery. a main wheel that communicates motion to others.
2.
Also called driver. Railroads. one of the wheels of a locomotive that transmits the power of an engine or motor into tractive effort.

Origin:
1830–40

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
driving wheel
 
n
1.  a wheel, esp a gear wheel, that causes other wheels to rotate
2.  any wheel of a vehicle that transforms torque into a tractive force

Collins English Dictionary - Complete & Unabridged 10th Edition
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