I agree that disruption is likely for months and possibly for years.
The
GWR▸ website and other sources certainly IMPLY that it will be back to normal in a few days at the most.
Many reports in the media refer to the need for inspections before returning the trains to service. Have ANY GWR trains returned to service after inspections ?
Saturday=10 units available
Sunday=5 units available
Monday=3 units available
Tuesday=2 units available.
Today
No reports refer to the need for major repairs.
My estimate for repairs, based upon common sense not upon detailed engineering study is as follows.
For the FIRST repair, including studies, paperwork, and refining the technique, a few months.
For the second repair, one month.
Thereafter as experience is gained, one set a week.
That comes to a couple of years. And is optimistically assuming that no other defects are found during the repairs.
It also optimistically assumes that after the repairs that the units will return to service reliably.
I expect a PERMANENT reduction in availability due to the need for extra inspections for the life of the trains.
If about 80 trains each require an extra one hour a day for inspections, that is the loss of about 80 train hours a day. Perhaps half of this could be covered by trains not needed during the off peak, but the other 40 train hours a day might need another 4 trains each working for 10 hours a day.