Everything built post 1995 is retention, that means there is a tank which needs to be emptied, which frequently isn't done or the process of empting delays trains, eg the platform 5 gig in Heuston with the new train
Some genius put the tank level indicator on a Mk4 inside, you can see it yourself on the wall to the left above the computer screen. That means more hassle since a full tank can't be spotted on a external inspection.
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