In the 1930s the Wellington end of the NIMT was deviated from Wellington to Tawa Flat by the construction of the Tawa Flat deviation, including two long tunnels. The deviation is the centre two tracks, with the Wairarapa Line's Ngauranga station in the background, alongside State Highway 1.
The NIMT approaching Auckland CBD through the eastern suburbs.
| |||||||||||||||||||||||||||||||||||||||||||