{TAIL ~ The elongated track} is mounted on {HEAD ~ the tractor} and extends in generally parallel upwardly spaced relation to the water main 
{ TAIL ~ The elongated track } is mounted on { HEAD ~ the tractor } and extends in generally parallel upwardly spaced relation to the water main
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH