{"id":"S85111029","label":"Railroads--Signaling","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh85111029","normalized_label":"railroads--signaling","broader":["http://id.loc.gov/authorities/subjects/sh85122402"],"aliases":[],"source_identifier":"http://id.loc.gov/authorities/subjects/sh85111029","provider":"lcsh","revision":"dcd0e44f6f153f77","taxonomy_revision":"f050b5d4780b1289","title":"Railroads--Signaling","url":"/topics/S85111029","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"10090394405979685444","address_version":"morton4x16-v1","coordinates":[0,20,19139,54272],"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}