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Built by the Wellington and Manawatu Railway Company (WMR), the full line to Longburn was completed in 1886 and trains were operated by the WMR until December 1908, when the New Zealand Railways Department purchased the WMR and incorporated its line into the NIMT.
Guy's great-grandfather was chairman of the Wellington and Manawatu Railway Company when the last spike was driven on the company's line at Otaihanga, an event re-created on 19 February 2011 when Guy drove the last spike at the new Waikanae Railway Station opening ceremony.
At the time the Wairarapa Line was completed, the Wellington – Longburn line was owned and operated by the private Wellington and Manawatu Railway Company, meaning all government trains from Wellington ran via the Wairarapa, giving a status of some importance to stations like Pahiatua.
From the 1897 completion of the Wairarapa Line until 1908, the route through the Wairarapa was NZR's primary means of accessing Wellington as the western line through the Kapiti Coast and Horowhenua was privately owned by the Wellington and Manawatu Railway Company.