Rimutaka Tunnel the first fully dieselised line in New Zealand. Today, DBR, DC, DFT and DX class locomotives run the route. There have been proposals to electrify the tunnel and the Wairarapa line as far north as Masterton as an extension of the Wellington suburban electrification. The tunnel was designed to enable catenary to be installed but this has not happened, and the catenary finishes just north of Upper Hutt station. In 2007, Greater Wellington Regional Council rejected a call to electrify the tunnel, on the basis that patronage did not justify the expenditure, and that the tunnel would "have to be
Mangaroa railway station on a tunnel through the Rimutaka Ranges. When the Rimutaka Tunnel opened in 1955, the line between Upper Hutt and Featherston then followed an alignment that bypassed Mangaroa altogether. The new Maymorn railway station on the Rimutaka Tunnel deviation was initially called "Mangaroa". Very little of the old railway formation remains between the west and east sides of the Mangaroa Valley. Cruickshanks Tunnel still exists, though there is no formal access to it and the status of public access is uncertain. The only remains of the old Mangaroa River bridge are a few wooden bridge piles. There is still a