Artifice

The 'magic' behind the warforged, trains, and much more.

Steel and wood.

Lots of effort and while magic is more often than not involved, it's still sheer man power as well as creative minds pouring themselves into it. Artificers find different ways to invent their technology whether that'd be with mainly magic or their own sentient devices that they invent. Every artificer is unique in their scientific inventions, even if they're learning from someone else, they'll eventually deviate far enough away from their master that they basically become their own version of the artificer.