A reference numeral 9 denotes a maintenance bay route for {HEAD ~ maintenance} of {TAIL ~ guided vehicles} 10 
A reference numeral 9 denotes a maintenance bay route for { HEAD ~ maintenance } of { TAIL ~ guided vehicles } 10
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH