Unless these errors are going to be fixed at the expense of the government / railway company. not the manufacturer, of course. (Sad laughter.)
However I do wonder if the modern ability to do very precise manufacturing means that designs now often just push to the absolute limit of the standards. A few decades ago there would be be a bit of margin left in for error, but now we can hit the limits of the envelope fairly precisely. Which means the infrastructure needs to do the same...
The delay is not caused by any mistake, despite what the press and politicians said; it's being caused by the established security protocols being followed (for one) to avoid a catastrophe (which has happened in the recent past for not being followed).
1 - https://twitter.com/unodelarenfe/status/1623588179520413696?...