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