However; In 1991 a 3 kilometers long heritage line opened to the recreational area Djurgården; and in 2000, the non-radial half-circle line Tvärbanan opened with articulated low-floor vehicles connecting an inner ring of Metro and commuter rail stations just outside the inner city proper, with subsequent extensions in 2003 and 2014; and in 2010 the heritage line was extended and converted to a regular service line.