In practice ,a rotor weighing about 10 tons and rotating at 3,000 r .p . m . may be so well balanced that the motion ,except for sound ,is just perceptible.

In-motion electronic track weighing scale (automatic track weighing scale) is a piece of equipment that automatically weighs wagons loads in motion.

While the weighing signal processing of the actual Weigh-in-Motion is simple digital filter and no further signal processing technique.