How to Build Effective Public Transportation?

[asriu]

This game have Bus, Tram and Train but any idea how to use it on efficient way?
Anyone have general idea who will use bus stop, train or tram station to which zone (density for example)? route, distance and such. Difference between small station, medium and big for train; small trams and big trams which track should be used and such? Public Transportation have nice animation, when see almost none use it although seem nice feel kind of waste.