A lost Maxis “Sim” game has been discovered by an Ars reader, uploaded for all - ArsTechnica

https://archive.org/details/simrefinery

Truly interesting times. Though it's an unfinished prototype rather than anything workers used as a training tool it shows the custom work into producing refinery things (like C4) and the fact there are still disasters in the build.

LGR has a video about this if anyone wants to know what it is. I am on mobile, so you'll have to search it in Youtube.