Queueing Network — Container Terminal Night Shift
Ninety-six trucks an hour through gate, yard crane, a three-desk customs inspection bay with only ten places and four quay cranes, showing the gate rather than the quayside sitting at the 80% ceiling.
Make it your own.
title "Container terminal — berth 8, night shift"
target 80%
arrivals "Gate in" 96/h
station "Gate in" { servers: 6; service: 3m; cv: 0.7 }
# Yard crane cycle time depends entirely on how deep the box is buried.
station "Yard crane" { servers: 8; service: 4m; cv: 1.35 }
# The inspection bay physically holds ten boxes; past that the lane is held.
station "Customs inspection" { servers: 3; service: 25m; capacity: 10 }
station "Quay crane" { servers: 4; service: 2m }
route "Gate in" -> "Yard crane" 1.0
route "Yard crane" -> "Customs inspection" 0.06
route "Yard crane" -> "Quay crane" 0.94
route "Customs inspection" -> "Quay crane" 1.0
route "Quay crane" -> exit 1.0