(Portland, OR) -- Starting Saturday, MAX Red Line trains will stop running between the Gateway Transit Station and Portland International Airport. Shuttle buses will run in place of the trains and passengers should plan to add an extra 30 minutes to their trip for delays. Work on the Red Line will add a second set of tracks at the airport and rebuild the station. Other improvements will be made on the line during the shutdown. This is the longest planned MAX disruption in TriMet's history.