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In short: The a train from the Northern Airport Line would be able to continue onto the Southern Airport Line and complete its trip at Manukau before doing the reverse back to the City Centre. It would be like post City Rail Link where currently terminating services at Britomart can run through the CRL improving efficiency and capacity of the network. I think this is good compromise for the Southern Airport Line allowing capacity, efficiency and connectivity for Southern Auckland workers to their employment places without the major expense of a full LRT line to Botany. - voakl.net