For the past year (2011) I’ve been working at Movares on a simulator for the training of bridge & lock operators. Operators of what??? the people that control locks/sluices for boats and plus some bridges.
More info about MOBZ can be found here and here
I now know a lot about them. I built the interface and logic behind the simulator all of it was done in the Unity Engine. Check out this video to see what is all about (sorry the voice is in dutch can’t help you there).

[youtube=http://www.youtube.com/watch?v=p4RK3Xmu4dI&w=500&h=400&rel=0]