The different color codes provide for easy identification of {HEAD ~ the proper location} for {TAIL ~ the rail assembly} 
for
The different color codes provide for easy identification of { HEAD ~ the proper location } for { TAIL ~ the rail assembly }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL