travel is depicted and fig7 where upward tilted bolster travel is depicted the contact point shifts from the design contact point indicated at dcp to the actual contact point indicated at acp for a given angle of bolster tilt the distance that the contact point shifts is proportional to the radius of curvature on the shoe slope surface in order for the forces acting on the shoe to intersect at a single point the column force vector must move up or down on the shoe face for the friction shoe to be stable the intersection of the column force vector with the column must be within the boundaries of the shoe face if it is not the shoe will tilt the present invention provides a friction shoe wherein the contact point is so located so as to minimize its shifting so that for any direction of motion and with bolster tilt up to approximately one degree from the vertical the column force vector will remain within the boundaries of the shoe column face and the shoe will not tilt this avoids uneven wear on the bottom or top of the shoe column face as frequently occurs with prior art friction shoes one embodiment of a friction shoe having the design criteria of the present invention is shown in fig8 friction shoe 24 has a friction wall 28 for engaging a friction surface on a side frame not shown the center line of the bias spring is indicated at 50 this line intersects slope or upper wing surface 40 at a point 54 that also is the intersection of.