What is "driving spring"

Driving \Driv"ing\, a.

1. Having great force of impulse; as, a driving wind or storm.

2. 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.