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Berney arms: I take your point about Heuston being better able to redeploy units when there is a failure. What would be interesting would be to compare the failure rates of Mk4 versus DD sets, say failures per 100 scheduled departures. They are after all performing much the same function, even though the journey performed by a Mk4 is about 50% longer than that of a DD.
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Mark4 would defiantly outperform DD in failure rates. There has not really been that many failures lately however of the ones I have observed it has been loco issues which is not the problem on Belfast route.
Another difference is issues with Mark4 can often be fixed without removing it form service something which the DD cannot. Now the extra sets of course help in such events.
With the third set been delayed not back (due in Feb) it would be about time that it spend 4-6 weeks running empty up and down to Dublin and all the current issues addressed before it comes back. After all fleets entering service down here had to run around 10,000 km/h before a single passenger could board and be fault free.
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Yesterday the 0735 ex Dublin failed and was replaced by a 29?
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To be fair you could probably count on a single hand how many times the 22's have not been available because of faults to carry out the scheduled to Belfast since they took over.