bolt 12 fig1 that is welded to the track rail 6 which penetrates a hole 55 fig1 in the first end of the spring 10 the bolt 12 is secured to the spring 10 by a nut 13 fig1 in retrofitting situations the fastener 11 is preferably the same bolt 12 that had been used to secure a tire 3 or other shock absorber an anchor 15 indirectly secures the second end opposite the first end of the spring 10 to a concrete base 2 that extends alongside the perimeter of the track 5 in preferred embodiments the second end of each arch shaped spring 10 is formed in the shape of a saddle 30 fig8 including a bracket or saddle seat 35 and an upturned section 36 fig7 an anchor bracket 70 fig1 14 straddles the saddle 30 to secure the spring 10 to the concrete base 2 in its simplest form the anchor bracket 70 comprises a rectangular planar metal plate fig1 with a thickness n of about one half an inch sides 73 and 74 each having a length l of about six and three eighths inches and sides 71 and 72 each having a width m of about two inches the anchor.