Patent ID: 6874426

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 crown upon which said bearing surface of said pedestal seat is engaged to permit lateral rocking motion of said sideframe; said crown having a local radius of curvature of less than 30 inches.