This compression aids in preventing {HEAD ~ the frame} 40 from sliding on {TAIL ~ the tie} 12, and further seals the rail seat area 18 beneath the tie pad from any incursion of moisture 
This compression aids in preventing { HEAD ~ the frame } 40 from sliding on { TAIL ~ the tie } 12 , and further seals the rail seat area 18 beneath the tie pad from any incursion of moisture
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH