They didn't call those guys running trains engineers for nothing. Back in those days, you didn't just throttle and brake - you had to have a decent clue about steam plant operation. Do something wrong and it's either BOOM or something fairly expensive happening.

I bet not all the valves were for steam or water, you probably also needed to control oil or even fuel-oil.

The automated bits with diesel or gas turbine electric must make things on modern engines really easy to run in comparison.

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.