I added another paint scheme for personal use to a train mod, which for this purpose I also copied from the workshop folder into the local mod folder. As the original had only one paint job this meant adding an empty, completely transparent base texture layer, and use the old and new paint schemes as decor graphics. Alredy done several times but this time I get a blurred train.

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3245105072
As you can (not really because with these graphics I could sell you this train as about anything from Amtrak Acela to NSW Rail XPT) the RENFE 120 class in the middle is blurred, while the equally treated 449 class on the lower track is pixel sharp. Also the 120 is sharp in Photoshop elements as well as in Windows picture preview. Only in the game it gets blurred. TKR's original graphics are now also blurred, so it cannot be an issue with my own PNG files.
Both orginal mods are by the way by the same modder TKR. Also if I download the original mod, the graphics are fine, so it must have to do with my local edit. But why doesn't it behave the same as other trains after I applied my changes?