the headlights would light normally, I think. the clock one is a bit trickier, though... If you were standing stationary beside the track and looked inside the train going at the speed of light, (or, say, c-1 mph, because nothing can actually reach the speed of light) it would seem to you that the clock is ticking slower than the one on your wrist. But if you were inside the train, the clock would still tick slower, but you wouldn't know it because you're going at hte same speed as the clock.
Does that make any sense? Feel free to correct me if I'm wrong