{HEAD ~ A parking track} of a gondola lift or chair lift comprises straight sections and {TAIL ~ curved sections} and chains for driving cars on this track 
comprises
{ HEAD ~ A parking track } of a gondola lift or chair lift comprises straight sections and { TAIL ~ curved sections } and chains for driving cars on this track
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH