Do you mean the 3 different refurbishments original then 1990s refurb and the latest? I could be wrong but from the first refurbishment and the wabtec one i feel they may be another but I could be wrong. I remember visiting the depot in the late 90s with a local railway group and the cars were going through their second refurb before the Wabtec one.
We will need to wait for the future as the tyne and wear metro is right now droven by automatic trains
During their life, they have record 3 different refurbishments The Tyne and Wear Metro is currently not driven by automatic train operation, it is manually controlled by drivers
