The electrification of the Maynooth line has slipped in priority since the new government came into office in May 2016. In response to a recent Parliamentary Question by Joan Burton TD the National Transport Authority stated:

Electrification on the Northern Line and the electrification of the Maynooth Line form elements of the overall DART expansion programme. Due to funding constraints over the last few years, only limited design work has been carried out on these projects to date. Following the additional funding recently announced as part of the Capital Plan review, it is intended to reactivate the design and planning work for these sub-projects during 2018. At this stage it is not possible to be definitive on the construction commencement date as this can only be finalised following the completion of initial design work. However, it is likely to be 2021 before building works starts, subject to receipt of the necessary statutory planning approval. Planning consent is likely to be sought during 2020”.

Commenting on this new information Dublin West TD Joan Burton stated,

this is very disappointing. Given that it will be two years before planning permission is sought it will be well into the next decade that the DART to Maynooth will become a reality