Patent ID: 7654204

Claim:
A rail road car truck comprising: a pair of first and second side frames and a truck bolster resiliently mounted transversely relative thereto; wheelsets, each wheelset having an axle having two wheels mounted thereto, and each axle being mounted to said side frames; each of said side frames having pedestal seats for receiving mating bearing adapters; a bearing adapter mounted to each end of each axle, each bearing adapter being matingly engaged in one of said pedestal seats; said pedestal seats having a bearing surface for mating with said bearing adapter; said mating bearing surface being chosen from the set of bearing surfaces consisting of (a) a planar surface; and (b) an arcuate surface having a radius of curvature greater than 50 inches; said bearing adapter having a curved bearing surface upon which said bearing surface of said pedestal seat is engaged, said bearing surface of said bearing adapter and said bearing surface of said pedestal seat being in rocking engagement; said curved bearing surface of said bearing adapter having a local radius of curvature for lateral rocking of less than 30 inches, and said truck bolster having lateral travel relative to said side frames of at least 1 inch to either side of a central resting position.