Noise Reduction: Finding the Simplest Dynamical System Consistent with the Data

A truck is provided with a torsionally compliant transverse member connecting to transversely spaced side frames. The side frames are suspended on the axles by a spring suspension system of generally cylindrical elastomer elements and a combined damping system. Both springing and damping are generally exponentially variable relative to increases in the load in the railcar. A central pivot pin transfers lateral and longitudinal loads between the truck and the car body without transferring substantial vertical loads. The center pin mounting in the torsionally compliant member is compliant. Vertical loads are transferred between the car body and the truck by omni-directional vertically-incompressible low friction side bearings.

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