Was a 29000 unit, being a brake system fault its not actually important what rolling stock it was. Brake system failures are fairly indiscriminate
The down line (Sligo bound) is supposed to be reversible. Wrong line working is possible using the crossover at Clonsilla level crossing and then onwards to the traling crossover at west of Glasnevin Junc, it does appear to be signalled for such but I don't know if the level crossings are signalled to allow it.
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