The fifth chapter of the manga adaptation of RWBY was published in Shueisha's Ultra Jump May 2016 issue on April 19th, 2016.
This chapter is a retelling of the first half of the "Black" Trailer, revealing that Blake was told by Adam that the White Fang was planning to hijack the Schnee Dust Company train and give the stolen Dust to the Faunus living underground.
The cargo train passing through Forever Fall
Atlesian Knights activate upon their arrival
Adam stuns an Atlesian Knight-130 with his weapon
Blake fights AK-130s on top of the train
Blake and Adam destroy the AK-130s
Blake and Adam find a case of Dust