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The line this station is on is called Østensjøbanen, check the top reference in the article. Sjakkalle(Check!) 06:24, 12 October 2007 (UTC)Reply
The logic behind this is that each station is located on only one line (or the common tunnel), but can be served by multiple services (1 through 6), for instance in the downtown area. The line numbers served by the station are indicated further down in the infobox with colored number boxes. Arsenikk 10:16, 12 October 2007 (UTC)Reply