'The Silver Spike' (starts 3 mins into video), a documentary about the history of the North Island main trunk line shown on the New Zealand Film Unit's Pictorial parade, No. 81, 7 November 1958.
'Film: the North Island main trunk line', URL: https://nzhistory.govt.nz/media/video/history-of-the-north-island-main-trunk-line, (Ministry for Culture and Heritage), updated 3-May-2019
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