The color codes 17A and 19A disposed on {HEAD ~ the rail} 16 of each rail assembly 42, 46 comprise {TAIL ~ a colored tape} 
The color codes 17A and 19A disposed on { HEAD ~ the rail } 16 of each rail assembly 42 , 46 comprise { TAIL ~ a colored tape }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL