If you were on the train you wouldn't see a thing. All that would happen is that your time would stop the instant you reached that all famous speed. So nothing goes on in your head as you race towards that train because your time stopped. You can't think. The time between now and the time of collision is zero. The instant your speedometer said "speed of light" you were on top of that other train. Instantly. Of course you wouldn't notice all this time stopping stuff because this is your frame of reference. you could truthfully say "I am not moving" so your thoughts wouldn't be slower to you. But in reality the amount of thinking you did between now and the collision was zero. It was as if you dozed off and never woke up again; It was all in an instantaneous flash flash. Since nothing can ever reach the speed of light anyway this seemingly paradoxical scenario can't happen.