Washington ( CNN ) Chemical odor causes 75 minutes -long evacuation at D.C. , Washington 's Union Station . Cause of odor was overheated battery system , official says . One person taken to hospital for evaluation after complaining of dizziness . the Washington Metro Area Transit Authority train service was suspended for 75 minutes , spokesman says .
Chemical odor causes 75 minutes -long evacuation at D.C. , Washington 's Union Station . Cause of odor was overheated battery system , official says . One person taken to hospital for evaluation after complaining of dizziness . the Washington Metro Area Transit Authority train service was suspended for 75 minutes , spokesman says .