The BR-390PoweredCoach and BR-390PoweredCoachFirst have an introduction date in 2001, whereas the rest of the Pendolino cars have an introduction date in 2003, which appears to be mismatched.
The BR-365Middle has a retirement date in 2020, whereas the rest of the cars are retired in 1999, also appearing to be mismatched.
Thank you for spotting that. I've amended the dates and the corresponding pull request is here (https://github.com/jamespetts/simutrans-pak128.britain/pull/70).
I believe that I incorporated Spenk's fix for this a little while ago - thank you for the report.