DENVER A trespasser on the tracks of RTDs Train to the Plane forced the transportation district to halt service at stops near the airport and instead bus people in to their destination Monday afternoon.The Regional Transportation District in a social media post announced the disruption shortly before 1:30 p.m., saying shuttle buses would be replacing the A Line at three stops near Denver International Airport, its last stop, due to a trespasser on the tracks.No other details about the incident were immediately available.The affected stops include the Peoria Station, the 40th/Airport Gateway Park Station, and the 61st/Pea Station.Service was expected to be impacted until later today, RTD officials said, with no estimated time of when service would resume at those affected stops.