{"id":"S85129583","label":"Subways--Signaling","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh85129583","normalized_label":"subways--signaling","broader":["http://id.loc.gov/authorities/subjects/sh85122402"],"aliases":[],"source_identifier":"http://id.loc.gov/authorities/subjects/sh85129583","provider":"lcsh","revision":"7bd0666a3910d657","taxonomy_revision":"f050b5d4780b1289","title":"Subways--Signaling","url":"/topics/S85129583","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"9550103205367645700","address_version":"morton4x16-v1","coordinates":[0,20,19429,48128],"answer_status":"Directory metadata; local answer requires separate source review","truth_status":"Subject descriptor, not a factual answer or a demonstrated knowledge gap","reviewed_answer":null}