The rail section has a profile that provides one or more roller contact areas extending {HEAD ~ a length} of {TAIL ~ the rail section} 
of
The rail section has a profile that provides one or more roller contact areas extending { HEAD ~ a length } of { TAIL ~ the rail section }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL