 The railway stations at Porirua, Paremata, and Dolly Varden were replaced with new stations with Dolly Varden station renamed Mana.Mana to Plimmerton double track and automatic signalling were completed on 16 October 1961, completing the double track and automatic signalling from Wellington to South Junction, and allowing more frequent train services north of Porirua station.Crossovers at Plimmerton allowed some trains to terminate at Plimmerton and return to Wellington during peak periods.