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Fox McCrossin, 58, and her wife Joan McCrossin, 56, died in the crash that happened on Main South Rd, Bankside on Sunday.
They were from Victoria, Australia.
Stuff reported the women's car veered across the road and into the path of the truck.
The truck tipped on its side on railway tracks. The driver was not injured. His company, TIL Freight South Island, said the man suffered emotional trauma and was receiving counselling.
A car travelling behind the women was also caught up in the crash, leaving the occupants with minor injuries, while another car further back was struck by debris.