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Alco Spring Industries is a full line replacement parts supplier of locomotive springs, standard “D” series freight car springs, wear plates, slope plates, side springs, gibs, bolster pocket wear plates, friction castings, restoring mechanisms, inner bolts, follower blocks, Y47 coupler yoke pins, pedestal filler blocks, retainer plates, single- and double-taper center pins, C-10 knuckle pins, vertical bolster wear liners and horizontal bolster wear liners. Alco is an AAR M-1003 certified quality manufacturer.