What lights are used in the day/night time on german trains normally. In terms of Higb beams, Marker Lights, e.t.c.
Usually, most commonly, the default/marker settings. The majority of highbeam usage I am aware of is greetings colleagues/trainspotters or shooing away roadside cars that have their highbeams on aswell. There may be individual drivers who use highbeams at night for better visibility themselves though, even though germany's heavy rail traffic relies on signals, not on sight.