The line runs from an interchange with the metro Red Line at Ropsten to Gåshaga, serves 14 stations on the southern half of Lidingö Island. In addition to track renewal and doubling, the project included resignalling, upgrading of electrification, and modernisation of stations, which are now fully accessible for passengers with reduced mobility.

Services are operated by a fleet of seven new 40.6m CAF A36 low-floor LRVs, which accommodate up to 159 passengers, 102 of them seated.

The line will be linked to Stockholm's City Line, which will be extended from Djurgårdsbron to Ropsten by 2020.