Patent ID: 7527003

Claim:
A side bearing for use in a railway car truck the side bearing comprising: a base having a bottom portion and a base wall structure extending generally upward from the bottom portion, the base wall structure forming a base receiving structure having an open top, a dual spring assembly positioned in the base receiving structure of the base section, the dual spring assembly comprising a first coil spring positioned within a second coil spring, the first and second coil springs each having a preselected spring, non-compressed height, an elastomer spring of a generally cylindrical rod shape positioned within the first coil spring, the elastomer spring having a non-compressed height less than the non-compressed height of the first coil spring and the second coil spring, a cap having a top portion and a cap wall structure extending generally downward from the top portion, the cap wall structure forming a cap receiving structure having an open bottom, a portion of the first coil spring and a portion of the second coil spring extending into the cap receiving structure open bottom to support the cap.