Red line (Stockholm metro)

The 1965 Greater Stockholm Metro plan proposed to run the Red line further north, from Östermalmstorg to Hägernäs. Stations were to be at Djursholms Ösby, Enebyberg, Roslags Näsby, Täby centrum, and Viggbyholm, terminating at Hägernäs. An additional station at Albano (between Östermalmstorg and Djursholms Ösby) was discussed. Another alternative was a completely new metro line, instead of using the previously-built existing railway tracks.[3]

A 1975 proposal would have extended the metro north replacing the Roslagsbanan, but discussions followed and in 1976 Stockholm County Council decided that the Roslagsbanan would remain; however, in 1978 the decision was rescinded. The following year the County Council decided that a surface rapid transit line should be extended to Täby centrum. Both Täby Municipality and Vallentuna Municipality held referenda on 23 March 1980 to decide if a metro should be built, resulting in a "no" vote. The County Administrative Board rejected the results—as public transport was a county issue not a municipal decision—but the municipalities refused to create detailed plans for an extension. In October 1980 the county council decided to continue with plans for the metro, but ultimately chose instead to in investments to the Roslagsbanan.[4]

For the other northern branch, which today ends in Ropsten, the proposal was to carry the metro on a separate rail-only bridge over Lilla Värtan and then in tunnel to a new station in Lidingö Centrum. Here the possibility for a further extension beyond Lidingö were also raised, with Baggeby, Bodal and Bogesundslandet as possible terminals.[3] (At that time Bogesundslandet was intended to be developed with housing.) In 1966 the Lidingö City Council decided in principle to extend the metro to Lidingö, but the plans were shelved. The City Planning Office produced sketches of the metro bridge in connection with the design of the new Lidingö bridge in 1971. Plans for a metro bridge again became relevant after damage was discovered in 2004 to the Old Lidingöbron, which will require its replacement. Nonertheless, the choice was made to invest in a new tram bridge, which will be cheaper and in general will provide similar travel times to Stockholm. It will also allow the Lidingö line to be extended to Spårväg City.[5]

In the south there were plans to extend the Fruängen branch to Huddinge centrum, Huddinge Hospital and Flemingsberg. Land for the right-of-way was protected, but no work has ever been done.[4]