A track link for a ground-engaging track in a machine comprising: an elongate link body including an inboard side and an outboard side each extending between first and second link body ends (25, 27) each having formed therein a track pin bore (40, 42) communicating between the inboard and outboard sides (33, 31) and configured to receive a track pin for coupling the elongate link body with adjacent elongate link bodies in a track chain (20, 22); the elongate link body further including a lower mounting surface for mounting a track shoe, and an upper rail surface configured to contact a rotating track-engaging element (11, 15) in the machine; the elongate link body further including a lower hardness material forming the lower mounting surface, and a sacrificial higher hardness material forming the upper rail surface, the lower mounting surface facing away from the upper rail surface in a height direction, a hardness of the sacrificial higher hardness material being higher than a hardness of the lower hardness material, the sacrificial higher hardness material transitioning to the lower hardness material at a material interface within the elongate link body; characterized by the sacrificial higher hardness material having a first depth and a second depth each of which extends in the height direction from the upper rail surface to the material interface, the first depth being different from the second depth, the first depth having a first hardness extending there through, the second depth having a second hardness extending there through, wherein the first hardness is substantially equal to the second hardness, wherein the varying depth from the upper rail surface of the sacrificial higher hardness material is configured such that penetration of a wear scallop resulting from the contact into the lower hardness material is retarded. an elongate link body including an inboard side and an outboard side each extending between first and second link body ends (25, 27) each having formed therein a track pin bore (40, 42) communicating between the inboard and outboard sides (33, 31) and configured to receive a track pin for coupling the elongate link body with adjacent elongate link bodies in a track chain (20, 22); the elongate link body further including a lower mounting surface for mounting a track shoe, and an upper rail surface configured to contact a rotating track-engaging element (11, 15) in the machine; the elongate link body further including a lower hardness material forming the lower mounting surface, and a sacrificial higher hardness material forming the upper rail surface, the lower mounting surface facing away from the upper rail surface in a height direction, a hardness of the sacrificial higher hardness material being higher than a hardness of the lower hardness material, the sacrificial higher hardness material transitioning to the lower hardness material at a material interface within the elongate link body; characterized by the sacrificial higher hardness material having a first depth and a second depth each of which extends in the height direction from the upper rail surface to the material interface, the first depth being different from the second depth, the first depth having a first hardness extending there through, the second depth having a second hardness extending there through, wherein the first hardness is substantially equal to the second hardness, wherein the varying depth from the upper rail surface of the sacrificial higher hardness material is configured such that penetration of a wear scallop resulting from the contact into the lower hardness material is retarded.