{TAIL ~ The system} 17, wherein {HEAD ~ the section control system} is configured to communicate with a post control system over a wireless link 
{ TAIL ~ The system } 17 , wherein { HEAD ~ the section control system } is configured to communicate with a post control system over a wireless link
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH