that rail retaining device cavities for rail retention clips 80 are staggered so that gauge bolt 150 cannot be seen in fig6 will not be placed in gauge panel 170 above rail retention clip cavity 176 and so that field bolt 250 will not be placed in field panel 270 above railroad clip 80 fig6 also shows field angle 240 secured to horizontal rods 290 gauge angle 140 is secured to gauge panel 110 by vertical rods 190 any combination of horizontal and vertical rods may be utilized in the preferred embodiment vertical rods 190 and horizontal rods 290 are spaced 12 u2033 center to center and are welded to the rebar rods not shown embedded in gauge panel 170 and field panel 270 persons skilled in the art will be familiar with a wide variety of ways in which to secure gauge angle 140 and field angle 240 to gauge panel 170 and field panel 270 respectively the spacing of the rods as well as the number of rods can be varied to maximize the strength of the unit fig7 shows an alternate embodiment of gauge panel 170 and field panel 270 in which gauge panel 170 extends down in a vertical direction from gauge angle vertical section 144 and gauge angle horizontal section extends outward away from gauge panel 170 providing support for gauge insert 110 likewise field panel 270 extends down in a vertical direction from field angle vertical section 244 and field angle horizontal section extends outward away from field panel 270 providing support for.