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