(14 May 2021, 9:04 am)Ianthegoon wrote They'll need to have worked out what causes the cracks, how fast they get bigger, and what might happen if the crack gets too big.  Once they've done all that - which is what's been happening over the last few days - they'll be able to look at each train individually and define a programme of checks for it based on what size the cracks are already.  (I've seen it stated that daily checks are likely).  Any train which already has cracks over a certain size won't be coming back until it's fixed.  Trains with smaller cracks can be used provided the crack doesn't reach that particular size, and when it does they'll have another unusable until fixed train on their hands.  And I've not seen anywhere yet that they actually have a long term fix plan, although the designers will be working hard to establish one if they don't yet have it!

It's the same with houses, not every crack is bad, some are just the building settling, some have been there over 100 years and haven't changed.