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The Conns Creek Branch was a 2.7 kilometre (1.7 mile) branch line railway in the West Coast region of New Zealand's South Island. It diverged from the Seddonville Branch at Waimangaroa and followed the southern bank of the Waimangaroa River to the line's terminus at Conns Creek at the foot of the Denniston Incline. The line operated from 1877 until 1967 and existed for the sole purpose of conveying coal from mines to the port of Westport.