Not sure if what I share below has been posted on here, but I think this shows how serious the issue is, and that it will be a long job to sort all units:-
Longest crack found so far = 285mm,
86 out of 93 trains affected (mixture of yaw damper and lifting pocket issues),
7000 grade aluminium which requires highly specialist welding to the point it will have to be overseen by The Welding Institute (TWI),
Intention for 800013 to have first welding and be tested, 800026 to have parts removed for analysis,
Any work or assessments will be overseen by an independent party (Ricardo Rail), so there can be no accusation of Hitachi/GWR ‘marking their own work’,
Nothing will be underwritten that is not safe,
Process/work to follow this sign-off procedure:
GWR/Hitachi,
Ricardo Rail,
ORR/DfT,
Work being done, and the process followed for safety validation, etc, to be communicated out to GWR staff via the FastLine for reassurance, etc,
Strict criteria for return into service will be put in place,
No exact/precise roadmap for return of trains, but as it stands only 8 would be available today,
The concern is that metal would come free from the set at high speed, rather than a structural failure being encountered,
Will be looking at whether this has been caused or exasperated in some way by infrastructure issues in the Western Region (track issues) by the use of instrument trains when possible.