The Beenleigh and Gold Coast lines have reopened, after they were flooded in last week's downpour.

Buses had replaced trains between Beenleigh and Kingston inbound, and Beenleigh to Kuraby outbound after stations and tracks were flooded.

A Queensland Rail spokeswoman said the initial problem was significant flooding at Beenleigh Station, but it took crews until Monday to clear the tracks at Holmview.