Talk of trams begin when it is hoped three routes would crisscross Edinburgh.
2003: Then Transport Minister Iain Gray announces £375m for Edinburgh to build two tram lines .
2004: Costs for lines go up one.
2007: SNP pledge to ditch both the tram scheme and airport rail link. SNP is outvoted. Work on diverting pipes and cables starts.
2008: Construction contract is signed with consortium of Bilfinger Berger, Siemens and CAF.
2009: Bilfinger Berger downs tools, claiming it is owed up to £80m extra payments.
2010: Tie fails to provide updated costs to council. Later that year Tie considers plans to terminate construction contract.
2011: Mediation talks held, work resumes.
2012: Council agrees compensation for firms affected by tramworks.
2013: Trial runs begin.
2014: Prices are unveiled.