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I have train group A with interrupts ... ( from IVTN: viewtopic.php?t=121001 )

I created train group B from train in group A, then i edited group B settings (replaced train station names) .... it modified group A station names ...

i want to have 1-2 trains for moving stuff in base (using narrow tracks from IVTN) + 3-8 trains that moves ore from far mines ...

any ideas?

If I understand your question appropriately, first assign Group A to a new train, then rename the train group for that train. Assigning an existing group and then renaming it has the effect of making a new copy of the original group. Any changes you make will only save to the group with the new name.