The articulated trackway sections permit engagement of a carrier and {HEAD ~ subsequent pulling} of the carrier from {TAIL ~ the descending elevator} 
from
The articulated trackway sections permit engagement of a carrier and { HEAD ~ subsequent pulling } of the carrier from { TAIL ~ the descending elevator }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL