This Tariff Concession Order (TCO) declares that specific "tunnel loading machines" (tariff classification 8430.50.00) that meet listed capacity and crawler-mounted requirements are to be treated under item 50 in Part III of Schedule 4 to the Customs Tariff Act 1995. The declaration takes effect from 30 June 2009 and continues until revoked under sections 269SC or 269SD of the Customs Act 1901 or an end date in the Table. Importers of machines matching the description will have their customs tariff treatment determined by that Schedule 4 item.