He wrote only probably. Maybe it works later or only new industries like locomotion.
Ah here: http://www.train-fever.com/forums/topic/optische-hilfsmittel-layer/#post-1633
“We have a few graphical overlays planned, for example height curves and traffic-displays. A display mode to display the zone of influence is not possible with our simulated passengers, the player has to study the city structure and create the best possible layout without this helper.”
You have to use your brain 🙂
