Suburban trains run on the NIMT at regular intervals as follows:
Eastern Line (Manukau to Britomart via Glen Innes) trains run on the NIMT between Puhinui and Britomart.

Southern Line (Papakura to Britomart via Otahuhu and Newmarket) trains run on the NIMT from Papakura to Westfield Junction.
They then run on the North Auckland Line to Newmarket, and the Newmarket Line to the vicinity of Quay Park, where they rejoin the NIMT only for the short section (about 500 metres) into Britomart.
A diesel train shuttle service runs on the NIMT between Pukekohe and Papakura.

Onehunga Line and Western Line trains use the NIMT only for the short section (about 500 metres) from the vicinity of Quay Park into Britomart.
Suburban trains run on the NIMT at regular intervals as follows:
Eastern Line (Manukau to Britomart via Glen Innes) trains run on the NIMT between Puhinui and Britomart.
Southern Line (Papakura to Britomart via Otahuhu and Newmarket) trains run on the NIMT from Papakura to Westfield Junction. They then run on the North Auckland Line to Newmarket, and the Newmarket Line to the vicinity of Quay Park, where they rejoin the NIMT only for the short section (about 500 metres) into Britomart. A diesel train shuttle service runs on the NIMT between Pukekohe and Papakura.
Onehunga Line and Western Line trains use the NIMT only for the short section (about 500 metres) from the vicinity of Quay Park into Britomart.
North Island Main Trunk