Rail road freight car with damped suspension

Railway rolling stock – Trucks – Axle bearing mounting

Reexamination Certificate

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C105S198200

Reexamination Certificate

active

11125118

ABSTRACT:
An auto rack rail road freight car is provided for carrying low density, relatively high value, relatively fragile lading. The car has trucks that have multiple dampers in a four corner arrangement in the sideframes. The dampers may include damper wedges having primary and secondary wedge angles. The spring groups in the side frames are relatively soft, giving a low vertical bounce natural frequency. In an articulated embodiment, differentially placed ballast is mounted in a biased arrangement to load the coupler end trucks to encourage a dynamic response similar to the dynamic response of the internal trucks.

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U.S. Appl. No. 09/920,437, filed Aug. 1, 2001, Rail Road Freight Car with Resilient Suspension.
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U.S. Appl. No. 11/125,118, filed May 10, 2005, Rail Road Freight Car With Damped Suspension.
U.S. Appl. No. 11/153,913, filed Jun. 16, 2005, Truck Bolster.
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U.S. Appl. No. 11/189,092, filed Jul. 25, 2005, Rail Road Freight Car With Resilient Suspension.
C. L. Combes et al., Car Builder's Cyclopedia of American Practice, Encyclopedia, 1961, p. 868, 21st edition, Simmons-Boardman Publishing Corporation, New York, USA.

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