{"id":"S93000066","label":"Big Boys (Steam locomotives)","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh93000066","normalized_label":"big boys (steam locomotives)","broader":["http://id.loc.gov/authorities/subjects/sh95009086"],"aliases":["4000 Class (Steam locomotives)","Big Boy (Locomotive)","Union Pacific 4000 Class (Steam locomotives)","Union Pacific Big Boys (Steam locomotives)"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh93000066","provider":"lcsh","revision":"ae94c83946fc97f8","taxonomy_revision":"f050b5d4780b1289","title":"Big Boys (Steam locomotives)","url":"/topics/S93000066","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"18229902855767648","address_version":"morton4x16-v1","coordinates":[0,22,11334,2048],"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}