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
Wainuiomata railway proposals proposed railway declined, but at the same time the population of Wainuiomata increased and commuters to Wellington desired a railway line. However, the terrain is not favourable for a railway. A line into Wainuiomata would require either a steep route over the hills, resulting in a slow journey, or a lengthy and costly tunnel. This geography has been the main contributing factor to the rejection of all proposals so far. The first proposal for a railway to Wainuiomata came as part of a route for the Wairarapa Line across the Rimutaka Range. Four routes were surveyed, including one through Wainuiomata.