>>1057777Line 1 runs north-south. It is 15.5km long, and features 19 stations; 7 underground. Beyond the tunneled portion, Line 1 runs at-grade, though some intersections are grade-separated.
A northern extension with one new station is currently under construction, Auditorio. Completion is expected sometime in 2017.
Line 1 originally started out in 1976 as a trolley-bus tunnel. The tunnel was designed for rail, but trolley-buses were used because cost was a factor. In 1989, the tunnel was converted for use of light rail.
