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I'm not sure your staffing problem can solve the whole problem, because there's domain knowledge in how to handle trains in particular sections of track. Speed maximums are probably easy although they do get screwed up in notorious incidents, but there's also things like how to deal with inclines.

Compare to knowledge workers like programmers needing to know the code base.

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Yeah, you'd have specifics that would have to be worked out, but I bet you could do it (it'd just cost money or time and time is money).

For example, you could run slower trains in general which could help with flattening out domain knowledge.

Or you'd pay for engineers to be trained in some large area, etc.

(This all goes to show that the real underlying problem is running at 99% of capacity with no slack at all available.)

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