>

They probably smuggle it across the border to Bolivia or Peru. At least that's what car thieves do.
“Cu later!” was all that was heard as the robbers left the area. >

You deserve Au for that. >

One don’t steal that much of raw materials unless s/he has buyer waiting. >

Based on the story it seems that it's a fairly regular thing with train copper heists, so if I had to guess they likely have a set up ready for it.