{"schemaVersion":"1.0","generatedAt":"2026-09-22","licence":{"status":"not-yet-granted","spdx":null,"statement":"No licence has yet been granted for SmellBook-created datasets. They are publicly readable; reuse beyond citation and quotation needs permission until a licence is published."},"node":{"entityType":"claim","urn":"smellbook:claim:a-seasonal-odour-in-railway-cars-linked-to-wall-insulation-foam","key":"a-seasonal-odour-in-railway-cars-linked-to-wall-insulation-foam","label":"A seasonal odour in railway cars linked to wall insulation foam","description":"In a case study of Australian passenger trains, volatile chemical compounds released by water from insulation foam in the car walls were identified as the likely cause of a seasonal, objectionable odour reported by travellers and drivers in the railway cars; the authors considered it unlikely that bacterial colonies in the air-handling (HVAC) systems were the odour source.","scope":"One case study of odour-affected trains in Australia, in which insulation foam taken from the car walls was exposed to simulated temperature and humidity combinations in a climate simulator to recreate the odour. It concerns one unwanted odour, not the everyday smell of train carriages; the cause is stated as likely, not proven, and the abstract does not name the compounds.","evidenceClass":"scientific","canonicalUrl":"https://smellbook.com/evidence/claims/a-seasonal-odour-in-railway-cars-linked-to-wall-insulation-foam","attribution":"SmellBook (https://smellbook.com)"},"outgoing":[{"relation":"cites-source","label":"cites source","entity":"smellbook:source:railway-car-odour-case-study-2024","entityLabel":"Odour and indoor air quality hazards in railway cars: an Australian mixed methods case study","record":"/data/graph/source/railway-car-odour-case-study-2024.json","provenance":[{"basis":"claim-record","field":"verifiedClaims[CLM-TRAINCAR-001].sourceIds","evidenceClass":"editorial"}]},{"relation":"claim-about","label":"claim about","entity":"smellbook:smell:train-carriage","entityLabel":"Train Carriage","record":"/data/graph/smell/train-carriage.json","provenance":[{"basis":"claim-record","field":"verifiedClaims[CLM-TRAINCAR-001].smellSlugs","evidenceClass":"editorial"}]}],"incoming":[],"corrections":[],"citation":null,"boundary":"Edges are typed and unweighted; none is a similarity, recommendation or personalization score. Browser-local Personal SmellBook data is never part of this export."}