 The Wellington Metro upgrade is expected to improve operation of the service.In 2019 the GWRC proposed replacing in 2025 the Capital Connection and Wairarapa Connection trains with 15 four-car dual-mode multiple units, to operate from overhead power from Wellington to Upper Hutt or an on-board power source north of Upper Hutt; to cost $415 million.In February 2020 the GWRC announced that the Wairarapa Connection carriages were to be refurbished to extend their life until new rolling stock is introduced.