Talk:Kuroyuri (episode)/@comment-4010415-20170122205254/@comment-4010415-20170127170922

The thing is, lightning Dust has been shown to be the yellow Dust. Even though the electricity itself keeps being shown as blue, the Dust used for it is yellow. I didn't think about steam Dust. That could be one option. Winter hid in a cloud of steam while fighting Qrow, and she has a light blue component in her sword, plus the geyser biome in the tournament had light blue crystals.

Though, SYUTK thinks that it's barrier Dust, producing a barrier around the train's engine to protect it from attacks.

Another possibility is that barrier Dust is actually a Dust type that produces force energy, allowing the person using said Dust to manifest the force energy in whatever manner they desire - the cyan laserbeams Weiss made in Players and Pieces, the barriers Weiss and the colosseum made, and making this train move forward.