(13 May 2021, 10:15 am)Andreos1 wrote https://www.itv.com/news/tyne-tees/2021-...rous-tests

When is a crack not a problem crack?
When it's had rigorous tests over a couple of days apparently.

Trains with cracks to return to service.

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!