>>1045626Tukholma (finnish name why?) has a nice T-bana (subway) system with county wide commuter rail and couple of light rail lines alongside with narrow gauge railways.
Buses are expansive and apparently non-diesel. Ferries to archipelago works quite fine what I've tried.
Also the commuter rail is going to be improved with the downtown tunnel making it more metro like system. There is the SJ Regional -trains to neighbouring counties providing faster option alongside the commuter rail.
Very good system, I use them all when visiting my relatives in Sweden. They also removed the fare zones and started using the 75(?)minute period ticket. Pic related, all the services in Stockholm county.