User blog comment:Zathronas/Analysis by an author: Trailer "Black"/@comment-98.109.162.219-20131224013521/@comment-98.109.162.219-20131225004035

Blake knows what she and the white fang has done, and realizes that their actions have indirectly hurt an innocent girl, but she didn't mean to and was even more shocked to see Weiss talking about it, because she never meant to hurt her. Blake was on screen to show her sad emotions on the realization of something she actually participated in hurt Weiss. Weiss mentions the train shipment because it the most prominant dust theft that Weiss remembers that is confirmed to be stolen to be an act by the White Fang (Some of the other thefts it was Roman, and it was unknown to Weiss that the theif (Roman) worked with the White Fang).

I doubt it was the same shipment because they might have been multiple shipments. Adam even says: "So we are going to have to do this the hard way", implying that the White Fang might have done this multiple times before, but maybe with much more ease.