At least it's the authentic Northern experience. All of the units are like that inside, and given the number of units Northern can turn out for service daily it's not particularly surprising that three all develop faults at the same time. These are actually chosen from the better ones anyway, because they're not in urgent need of corrosion repair works, which an enormous number of them are.
At the end of the day the problem isn't Northern or LNR or whichever depot would be unlucky enough to have to attempt to keep them going. The problem is that some members of the class have been carrying passengers for over 40 years now and they're life expired.