sentences:  By 1993, the western end had been upgraded to metro standard, Valkyrie plass was closed, and the first trains ran through the whole tunnel.The section from Tøyen to Brynseng, although not completely located within the tunnel, is considered part of the Common Line.At Majorstuen, the line splits into three; the Røa Line, the Holmenkollen Line and the Sognsvann Line.