 During peak periods many multiple unit trains were now terminated at Porirua and returned to Wellington to provide a more frequent service between Wellington and Porirua than was provided for stations north of Porirua.Extension of the double track and automatic signalling continued with the Porirua to Mana section opened on 7 November 1960.The work involved harbour reclamation to construct straight tack from Porirua to Papakowhai, just south of Paremata, eliminating the tight curves as the former railway followed the coastline, and creating three lagoons on the eastern side of the harbour.