Untreated wooden railway and tramway sleepers — commonly called cross-ties in North American rail parlance — are shaped timber products used as the transverse load-bearing elements beneath rail tracks. Because they are not impregnated with creosote or other preservatives, they are distinct from the treated-sleeper category and typically serve niche applications or markets where chemical treatment is restricted. USDA APHIS phytosanitary requirements apply to wood imports, and buyers should confirm that untreated ties meet the structural and durability specifications of the relevant rail authority before procurement.

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