swesl Stockholms lokalbana is a light rail system. System color should be changed from blue to green.
That's making it heavier, not lighter!
Green is tier 2/Suburban Rail is - the lokalbana does function like this (IIRC, it's converted isolated heavy rail lines)
Red is Light Rail/Heavy Tram/tier 4 - the lokalbana uses these vehicles
I felt the system was inbetween the two - so gave it the blue/tier 3 of Metro.