{"product_id":"kato-20-050-n-scale-unitrack-78mm-108mm-3-4-1-4-expansion-track-1pc","title":"KATO 20-050 N Scale Unitrack 78-108mm (3\"–4-1\/4\") Expansion Track","description":"\u003cp\u003eThe \u003cstrong\u003eKATO 20-050\u003c\/strong\u003e is an N Unitrack \u003cstrong\u003eexpansion track\u003c\/strong\u003e — a single section that telescopes between 78 mm and 108 mm (3′′ to 4-1\/4′′) on a precision sliding mechanism, used to absorb thermal expansion in long Unitrack mainline runs or to fill awkward variable-length gaps in a track plan.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow it works:\u003c\/strong\u003e The sliding joint maintains electrical continuity and gauge across a 30 mm length swing — essential for portable or transportable layouts where benchwork expands and contracts with humidity changes.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKATO N Unitrack system:\u003c\/strong\u003e Code 80 nickel-silver rail molded into a factory-attached ballasted plastic roadbed, with integrated UniJoiners. Unitrack is KATO's flagship N-scale track system established in the 1960s — the dominant N-scale sectional track worldwide.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eScale:\u003c\/strong\u003e N\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 78–108 mm \/ 3′′–4-1\/4′′ adjustable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Sliding expansion joint\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e 20-050\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KATO","offers":[{"title":"Default Title","offer_id":45099221450934,"sku":"381-20050","price":9.92,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/5131\/1286\/files\/57_25aa1a3a-0ae4-4737-8c57-f0a339e52dce.jpg?v=1779570785","url":"https:\/\/oakvillemodeltrains.com\/products\/kato-20-050-n-scale-unitrack-78mm-108mm-3-4-1-4-expansion-track-1pc","provider":"Oakville Model Trains Depot","version":"1.0","type":"link"}