Interestingly, the 06:15 Cork-Dublin this morning was 10 minutes late into Mallow after crawling the whole way for no obvious reason. It then managed to do Mallow-Limerick Junction in 28 minutes, to get pretty much back on time.
So, the 30 minutes between Mallow and Limerick Junction is easily doable on present track with a small bit to spare.
So, the only real reason getting both the up and down train in Limerick Junction at the same time can't happen is the lack of a Cork-bound platform.
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