A CTA Purple Line train passes over the viaduct at Greenleaf Street

A CTA Purple Line train passes over the viaduct at Greenleaf Street, one of three viaducts in Evanston slated for replacement by the transit agency. (Jonathan Bullington/TribLocal)

( (Jonathan Bullington/TribLocal) / June 21, 2012 )

A CTA Purple Line train passes over the viaduct at Greenleaf Street, one of three viaducts in Evanston slated for replacement by the transit agency. (Jonathan Bullington/TribLocal)

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