From Oslo, a "Lokaltog" pulling into National Theater Station in downtown. It's my ride to Lysaker, the 'burb just to the west of the city where a lot of the tech companies have their offices.
Public transit in Oslo is comparatively inexpensive. A 7-day tourist pass that covers commuter rail (this train, for example), trolleys, and buses, costs NOK220, which is about US$38.