I love being able to turn on transit lines on Nokia Maps, but I think that having a finer grain in selection of what lines to show based on operator would make the option even better.
Example, at the moment in Toronto it shows both TTC ( Light Metro) and GO (Commuter Rail) lines. This creates a lot more visual noise, it would be nice to have a choice to select one or the other or both.
If you take a look at Manhattan on Nokia Maps you can see an *extreme* case of the problem at Penn Station. I'll admit their complex subway system is part of the problem, but it looks like Nokia Maps shows LIRR, NJ Transit etc. as well all at once and it gets to the point where it's just not coherent.