It will, if built, be used for passenger trains going between Gothenburg-Stockholm, Gothenburg-Borås, Malmö-Linköping-Stockholm, Linköping-Stockholm and more connections. The travel time Gothenburg-Stockholm is expected to be 2:00 to 2:15 compared to 2:45 to 3:00 today. The travel time (Malmö-)Linköping-Stockholm would be cut by 40 min, Jönköping-Borås by 40 min and Gothenburg-Borås by 20 min. A more dense schedule is possible also. It is also planned to have railway stations at the Gothenburg-Landvetter Airport and the Stockholm-Skavsta Airport. The disadvantage with the project is the big cost.
The railway has a detailed plan between Gothenburg-Borås, and between Linköping-Södertälje (this part is called Ostlänken). Detailed planning is being done between Borås-Linköping. It was announced in August 2012 that the Swedish government had decided to proceed with Ostlänken. The announcement also contained details of the proposed double-tracking upgrade between Mölnlycke and Bollebygd as part of the programme, though the announcement didn't say what has happened to the original plan to build a station on the presumably-discontinued section of high-speed line between Mölnlycke and Bollebygd serving Gothenburg's Landvetter Airport (which is currently a few kilometres away from the existing railway line).