Analyze the relationship between 'Aurizon' and 'coal' within the context of the input sentence.
Options: location of formation, product/material produced, director/manager, distribution format

Plans to build the rail link that would introduce Galilee Basin coal to the Aurizon network have been shelved and Hockridge does not expected them to be removed from the dust until end the of the decade at the earliest.
product/material produced