I think this train is meant to travel ahead of the 0600 from Waterford:
It is scheduled to travel 6 mins after the 0505 from Cork (at Portlaoise) which stops at Portarlington and Newbridge so the 0515 should be right behind the Cork train. The Cork train passes through Kildare at around 0730 so you would expect the 0515 to pass at 0735 and the Waterford to fall in behind at 0740.
As the 0515 uses the slow line, one would expect the Waterford to overtake it thus preserving it's 0820 arrival slot.
Clearly the 0515 failing to make this slot and ends up running between the Waterford and the 0725 from Portlaoise (0748 at Kildare) and delaying the later and following Westport services.
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