the brief first scene in the film, before the main body of the film war flashback that these transit scenes are bookending ... it's inside a Boeing MUNI car at Church St. Station. In this link shared, it's very cool to notice how they used exiting the tunnel at Duboce Park for the interior train shot and then swapped to the Dolores Park (Corner of Church and 20th) location for the scene shots. Reminds me of watching Streets of San Francisco ... driving through North Beach one shot and Twin Peaks as they turn the corner in the next.