A track chain member comprising: a shoe member; and a first rail member extending from the shoe member, wherein the first rail member defines: a track chain traveling direction (T, 114) and a lateral direction generally perpendicular to the track chain traveling direction (T, 114); a first support surface extending generally in both the track chain traveling direction (T, 114) and the lateral direction defining an outer lateral extremity; and a first crest shaped member disposed laterally adjacent the outer lateral extremity of the first support surface; a second rail member extending from the shoe member, wherein the second rail member defines: the track chain traveling direction (T, 114) and the lateral direction generally perpendicular to track chain traveling direction (T, 114); a second support surface extending generally in both the track chain traveling direction (T, 114) and the lateral direction defining an inner lateral extremity; and a second crest shaped member disposed laterally adjacent the inner lateral extremity of the second support surface; wherein the first rail member is spaced away from the second rail member, defining a groove therebetween; characterized in that the first and second support surfaces (406,414) are coplanar; and wherein the track chain member further defines a concave arcuate surface joining the first support surface to the first crest shaped member, the first crest shaped member defines a first angled surface forming a first oblique angle (φ) with the lateral direction and the concave arcuate surface joins the first support surface with the first angled surface, the first crest shaped member defines a convex arcuate surface near the zenith of the first crest shaped member, the first crest shaped member defines a straight surface near the zenith, the first crest shaped member defines a second angled surface on the opposite lateral side of the first crest shaped member as compared to the first angled surface, wherein the second angled surface forms a second oblique angle (γ) with the lateral direction. a shoe member; and a first rail member extending from the shoe member, wherein the first rail member defines: a track chain traveling direction (T, 114) and a lateral direction generally perpendicular to the track chain traveling direction (T, 114); a first support surface extending generally in both the track chain traveling direction (T, 114) and the lateral direction defining an outer lateral extremity; and a first crest shaped member disposed laterally adjacent the outer lateral extremity of the first support surface; a track chain traveling direction (T, 114) and a lateral direction generally perpendicular to the track chain traveling direction (T, 114); a first support surface extending generally in both the track chain traveling direction (T, 114) and the lateral direction defining an outer lateral extremity; and a first crest shaped member disposed laterally adjacent the outer lateral extremity of the first support surface; a second rail member extending from the shoe member, wherein the second rail member defines: the track chain traveling direction (T, 114) and the lateral direction generally perpendicular to track chain traveling direction (T, 114); a second support surface extending generally in both the track chain traveling direction (T, 114) and the lateral direction defining an inner lateral extremity; and a second crest shaped member disposed laterally adjacent the inner lateral extremity of the second support surface; the track chain traveling direction (T, 114) and the lateral direction generally perpendicular to track chain traveling direction (T, 114); a second support surface extending generally in both the track chain traveling direction (T, 114) and the lateral direction defining an inner lateral extremity; and a second crest shaped member disposed laterally adjacent the inner lateral extremity of the second support surface; wherein the first rail member is spaced away from the second rail member, defining a groove therebetween; characterized in that the first and second support surfaces (406,414) are coplanar; and wherein the track chain member further defines a concave arcuate surface joining the first support surface to the first crest shaped member, the first crest shaped member defines a first angled surface forming a first oblique angle (φ) with the lateral direction and the concave arcuate surface joins the first support surface with the first angled surface, the first crest shaped member defines a convex arcuate surface near the zenith of the first crest shaped member, the first crest shaped member defines a straight surface near the zenith, the first crest shaped member defines a second angled surface on the opposite lateral side of the first crest shaped member as compared to the first angled surface, wherein the second angled surface forms a second oblique angle (γ) with the lateral direction.