September 1927. It’s not clear which viaduct this is – my guess is Matahorua based on the fact that it has that plate girder span on each end. Railway construction on the Napier-Gisborne Line was almost completed to Wairoa by the time of the Depression and the Napier earthquake. But because of the earthquake damage, the works were suspended The line was officially opened to Putorino on 6 October 1930, but the rest of the section to Wairoa had the work suspended by the earthquake and it was not resumed until 1936. It was finally handed over to NZR on 1 July 1939.
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