March 14 (Reuters) - Aurizon Holdings Ltd AZJ.AX :
* Aurizon extends NSW coal haulage agreement AZJ.AX
* Has secured a long-term contract extension with bhp billiton for its Mt Arthur coal mine in the hunter valley to June 2028.
* Contract allows potential increase in aurizon's coal haulage volumes from current 18 million tonnes per annum up to a maximum of 26 mtpa
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