I think I have an answer to my own question, but I'm still not sure I get the logic:
Quote:
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The station location is at the west end of the Midland yard and is not connected to the former GS&WR and GNR(I) lines. The location was chosen to allow construction of the proposed underground Interconnector station to take place at the east end of the yard in future without having to disrupt services.
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http://www.irrs.ie/Journal%20160/160%20News.htm