The first release in Tainted Trains new Numbers series on the Barcelona-based 2W Records label is a two-track issue called Seven. The first of these tools, Seven A, is a slow-burning builder. The pounding bass is gradually layered with high hats, kick drums, head-nodding hand claps and samples until it becomes a full-blooded floor-filling slammer, and when it kicks back in after the drop it nails it as a future club favorite. Seven Bs opening bass drum is soon accompanied by an oscillating hook that drives the track relentlessly forward, picking up high-end percussion and sampled horns along the way and never dropping in intensity. Both tracks are perfect DJ tools that are sure to feature prominently in future playlists.