Slightly off topic, but does Limerick-Limerick Junction not take a lot more traffic that the two sections you mention? I know it is already double-track between Limerick and where the Nenagh branch diverges, but there still must be some kind of case for it.
Agreed on the Kerry line though.
With only 8 services each way a day, having a passing loop every 10 minutes would be completely adequate.
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