I think there is something close to that.
You can see it from the city, not the station.
It uses the minimap destinations button while opening the City Hall information dialog.

The city currently selected is on the right. You can see many yellow pixels around it.
They represent a successful trip from the city to colored pixel.
On the other hand, the pink pixels are going to get there, but it takes too long, and the dark red means there is no route.
They are slightly visible towards the left of the map.
One of the two maps in the city info dialog has the same role, but it's very hard to read.