The light the headlights of the ICE 3 from KWG emit to the outer world disappears when going farther than like 40 meters, which is way too short for it to do that. the video I made demonstrates the issue very well:
by the way this will get worse with volumetric fog, which will also be available on TSW3 routes when using them on TSW4, most likely we will not be able to see the light then