The Collaborative International Dictionary
Driving \Driv"ing\, a.
Having great force of impulse; as, a driving wind or storm.
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Communicating force; impelling; as, a driving shaft.
Driving axle, the axle of a driving wheel, as in a locomotive.
Driving box (Locomotive), the journal box of a driving axle. See Illust. of Locomotive.
Driving note (Mus.), a syncopated note; a tone begun on a weak part of a measure and held through the next accented part, thus anticipating the accent and driving it through.
Driving spring, a spring fixed upon the box of the driving axle of a locomotive engine to support the weight and deaden shocks. [Eng.]
--Weale.Driving wheel (Mach.), a wheel that communicates motion; one of the large wheels of a locomotive to which the connecting rods of the engine are attached; -- called also, simply, driver. See Illust. of Locomotive.
Wiktionary
n. On a steam locomotive, a powered wheel driven by the locomotive's pistons or turbine.
WordNet
n. a wheel that drives a motor vehicle (transforms torque into a tractive force)
Wikipedia
"Driving Wheel", also called "Drivin' Wheel" or "Driving Wheel Blues", is blues song recorded by Roosevelt Sykes (listed as "The Honey Dripper" on early singles) in 1936. It became a standard of the bluesand has been recorded by numerous artists, including Junior Parker and Al Green who had R&B and pop chart successes with the song.
Usage examples of "driving wheel".
The single driving wheel on either side of the engine was nearly eight feet in diameter, and even the bogie and trailing wheels were nearly the height of a man's chest.
If that isn't enough pulling power to satisfy USE engineers, we can instead design a 4-6-0 'Ten Wheeler' (Alexander PL30), which, with the same driving wheel load, could have 12,000-18,000 pounds traction, and could handle 800-1,200 tons level or 160-240 on the 3%.
He was no longer the driving wheel of any group, Most Likely to Succeed or otherwise, but he was always on time, never missed a practice session, or fucked up an audition.
It was where I had left it and I got behind the driving wheel, switched on the engine, and then sat there for a moment, letting the tension drain away.
He gripped the driving wheel, pressing his palms down upon it to pain them.
The engine stuttered and boomed as she downshifted, but she did not lose the car's minimal traction except for the instant a driving wheel slipped on garbage and the coupe's right side streaked the plaster silver.