The insert 52 is thus compressed within the cavity 50 and against {TAIL ~ the rail seat area} 18 of {HEAD ~ the tie} 12 
The insert 52 is thus compressed within the cavity 50 and against { TAIL ~ the rail seat area } 18 of { HEAD ~ the tie } 12
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH