Gonna go positive.
To be honest, with the Streak or Tram, I kinda get caught off guard (like checking some stuff in F7, talking with people, etc) and I completely forget about how fast I'm going. Having some sort of beep sound wouldn't be too bad and it could help the player to remind them to slow down instead of having a message at the bottom corner of their screen. Also, it is kinda hard to notice the shaking screen since the camera is kinda far from the train's radius.