The hacker news post for this has some interesting discussions.
I thought this in particular was interesting
A company I used to work for built a large sim for an Australian mining company, using a commercial game engine and a large ‘igloo’ type structure as the interaction environment. This was chosen over VR because it was believed to be easier to have groups of trainees in the same environment. The trainees were equipped with physical ‘torches’ that were geometrically paired with the virtual environment so you could actually shine a pointer on objects.
The main training tasks were spatial orientation in the large 3D maze that was the mine, as well as hazard recognition and safety /;emergency training. E.g. knowing which way to go if an explosion occurred and how to avoid being crushed by the large vehicles that moved through the mine.
The main unexpected development cost turned out to be the high degree of customisation required of the virtual assets, in particular the signage. Every tunnel and shaft had individual location and safety info on signs, and these had to be correct or the training value was lost.
Other sims brought up:
Oakflat Nuclear Power Plant simulator for MS-DOS, apparently the company is still around and makes similar products still
Ports of Call, a shipping sim
AirWay sim, a business sim about running an airline
Apparently MIT just makes a lot of different business sims