MK4 is cleared to 90mph for a considerable portion of the Mallow Cork section, railcars are stuck at 70mph. Mk4 brakes are comparable to a railcar set as well, much better than the Mk3
There is a clear inconsistency in the times allocated for that part of the journey
You can't go below 2:35 without altering the hourly pattern which will only work if the time is 2:20 or better which is unlikely for the next 5 years or so
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