Patent ID: 6971319

Claim:
A friction wedge assembly for use in a suspension system of railroad car trucks, said friction wedge assembly comprising; (a) a wedge having a bolster engaging surface, a truck side frame engaging surface and a surface disposed between said bolster engaging surface and said truck side frame engaging surface for engaging a means disposed in such truck side frame for providing a load on said friction wedge assembly; (b) a bonding matrix having a plurality of cavities disposed on said truck side frame engaging surface of said wedge, said plurality of cavities having a predetermined configuration; and (c) a composition liner, a first side of said composition liner having a predetermined configuration engageable with said bonding matrix and a radially opposed second side of said composition liner for engaging a metal wear liner disposed on a side frame of a railroad car truck; and wherein said predetermined configuration of said first side of said composition liner is compatible with said predetermined configuration of said plurality of cavities on said bonding matrix.