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