SL to invest SEK175 million on tram line in Sweden December 12, 2011 | Europe News Stockholm-based public transport company Storstockholms Lokaltrafik AB (SL) has decided to double-lane segments of the tram line in Lidingö. The aim of the SEK175-million renovation project is to en... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password