The MetroLink network consists of two light rail routes. The older one, now called
the Red Line, has grown to be the nation's longest run, extending more than 37 miles. From the northwest it goes from Lambert Airport into downtown St. Louis, and then across the
Mississippi River. In Illinois it heads through East St. Louis and
other areas southeast to the Shiloh-Scott terminal, far into St.
Clair County. The newer Blue Line runs nine stations on its own
southwest of St. Louis from Shrewsbury-Lansdowne I-44 before joining the
older route into a closer-in Illinois terminal.
The lines use old railroad tunnels
for a mile-long subway under center city. The Mississippi River is crossed
Eads Bridge, which at well over a century old is a landmark in the
nation's bridge history. Part of it shows in this image, taken from
the St. Louis side, with an outbound train crossing on the lower level
of the structure.