Help:Driver Onscreen Help
From TrainzOnline
Click this Help (?) button to turn on and off the on-screen help about junction/turnout/point directions, name of junction, etc.
Novice users should keep this turned ON while learning how to drive or while driving an unfamiliar route.
Think of this as another Heads-Up Display feature.
This is NOT the same function as the In-game Help (?) button in the upper right-hand of the top menubar.