The rail assembly 44 includes a silver color code and {HEAD ~ the rail assembly} 46 includes {TAIL ~ a black color code}  
includes
The rail assembly 44 includes a silver color code and { HEAD ~ the rail assembly } 46 includes { TAIL ~ a black color code }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH