Thanks for those photos, bags. I lived in York for ten years and they bring back memories.
I haven't replied because I've been busy with family here. Hadn't realised I had to respond immediately!
Your photos show the trains in question. You are correct that it's not Transpennine. However, it is Northern Rail. The trains are built as a bus, by Leyland. Everybody complains about how uncomfortable they are, and they are supposed to be going to be replaced by Hitachi trains being built in County Durham. I think it's at Newton Aycliffe, or it could be Ferryhill. I am sure you will correct me if I'm wrong, and then Ana will agree with you.
Probably Northern will not get the new trains as Northern are always the last in line. We will probably get Transpennine cast-offs.
I do not need to put the pictures on, as you have very kindly done it yourself.