The Oslo Tramway 

The Oslo Tramway operates in Oslo, Norway. It has 6 lines numbered 11-13 and 17-19. It mostly operates with the old style SL79 Trams which are unlike many modern trams as they can only operate in one direction and must use a balloon loop to turn around at termini. SL95 trams are larger and are mosly used on routes where a balloon loop is not available. Both of there are being replaced by SL18 Trams which are much more modern.
It is a diverse system with both conventional street running and light rail style lines. Between Jar and Bekkestua the trams share track with the regular Metro trains, which is shown in this video.