{HEAD ~ The conveying route} comprises first rails and {TAIL ~ second rails}, extending in the different directions and intersecting each other 
comprises
{ HEAD ~ The conveying route } comprises first rails and { TAIL ~ second rails } , extending in the different directions and intersecting each other
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH