Ideally, such an isolated city & airport should always be well equipped.
https://en.wikipedia.org/wiki/Perth_Airport#Facilities_and_services
https://en.wikipedia.org/wiki/Perth_Airport#Third_runway
https://en.wikipedia.org/wiki/Airport_line,_Perth
https://en.wikipedia.org/wiki/Airport_line,_Perth#Rolling_stock
"The platform is in excess of 150 metres (490 ft) long, making it long enough for a six-car train, the longest Transperth trains." https://en.wikipedia.org/wiki/Bayswater_railway_station,_Perth#Description
https://www.avenueperth.com/why-is-perth-isolated/
https://www.budgetyourtrip.com/compare/perth-vs-honolulu-2063523-5856195