{TAIL ~ A data processor} is used for registering the time of the day when the passage is detected, the time of {HEAD ~ the day} when a change of state occurs at each station 
{ TAIL ~ A data processor } is used for registering the time of the day when the passage is detected , the time of { HEAD ~ the day } when a change of state occurs at each station
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH