text: There is no Sognvann-Mortensrud metro line #3, like relation=453207 shows. It seems this is some merger of lines 3 and 6: https://www.wikidata.org/wiki/Q15731038#/media/File:Oslo_Metro_diagram_no.svg .
  
  Needs tobe split and assigned the line #3 and #6 wikidata to the relations properly.