Not hard to see that a consistent long term roll out will be more cost effective than lots of one-off electrification.
I'm sceptical of the chances of it happening here, but the smart thing would be to use the Dublin area electrification to kick off a gradual electrification scheme for the whole country. The Cork commuter network would be the obvious follow on, perhaps followed by inter-city lines. Dual mode trains would allow the benefits of electrification to be realised immediately, and the benefits would increase as the project progressed.
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