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HSChapter 86
Rail tank cars designed to carry liquids, gases, or bulk chemicals in pressurized or non-pressurized tanks are classified under 8606100000 when not self-propelled. Canada is the dominant supplier to the US market, a pattern driven by the integrated North American freight rail network and the large cross-border movement of crude oil, chemicals, and agricultural liquids. Importers should be aware that tank cars carrying hazardous materials are also subject to Pipeline and Hazardous Materials Safety Administration (PHMSA) design and specification requirements independent of customs classification.
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Yes. Tank cars used in US hazardous-materials service must comply with PHMSA tank-car specifications (49 CFR Part 179), which govern shell thickness, pressure ratings, and safety appliances. Customs clearance under 8606100000 is separate from and does not satisfy PHMSA equipment approval.
The integrated North American rail network means Canadian-built cars move freely across the border in interchange service. Shared AAR (Association of American Railroads) interchange standards, proximity, and established manufacturing capacity in Canada all contribute to its dominant position in this category.
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