This is a short section of The Dance of the Sugar Plum Fairy from Tchaikovsky's Nutcracker suite.
Where the notes are stacked, are they meant to be played as double stops, or do some violinists play the top note while others play the bottom?
After reading this, I suspect they're supposed to be double stops. But how do I know this wasn't done to economize the number of staves? Or would there always be another staff if there was another part?
I'm not a violinist, so I don't know.