{"id":"S2001011738","label":"Railroad signal towers","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh2001011738","normalized_label":"railroad signal towers","broader":["http://id.loc.gov/authorities/subjects/sh85110913","http://id.loc.gov/authorities/subjects/sh85136296"],"aliases":["Signal boxes","Signal towers, Railroad","Signalboxes","Switch towers"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh2001011738","provider":"lcsh","revision":"3f6841ce73785a99","taxonomy_revision":"f050b5d4780b1289","title":"Railroad signal towers","url":"/topics/S2001011738","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"613760593924858370","address_version":"morton4x16-v1","coordinates":[0,477,5136,26624],"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}