Otira - 8566 m - opened 1923 - between Arthurs Pass and Otira, in the Southern Alps on the trans alpine South Island Midland Line - continuous 1 in 33 grade - electrified until 1990s.
Tawa No. 2 - 4324 m - opened 1935, goods on 1 line, 1937 all traffic - longest double track tunnel in New Zealand. Between Wellington and Tawa.
Tikiwhata - 2989 m - opened 1943, between Wairoa and Gisborne[?].
Lyttelton - 2596 m - opened 1867, between Heathcote valley, (Christchurch) and Lyttelton.
Turakina - 2091 m - opened 1947, between Marton and Wanganui[?].