A federal judge has removed another issue that could have blocked construction of a light rail in Maryland.

The Washington Post reports that on May 30, the judge dismissed part of a lawsuit that alleged the environmental review of the Purple Line violated protections on endangered species and migratory birds.

Maryland officials can appeal the remaining issues from the suit, which requires more studies on the possible effect of declining subway ridership.

Work on the 16-mile line has been delayed 7 months because of a federal suit filed by opponents of the line to connect Montgomery and Prince George’s counties.