This seems like a logical fallacy because it's assuming a lot of things.

Given the regulations around rail, if an engineer is qualified for both diesel and electric locomotives, it's hardly outside their job description.

And your rule would require unnecessary staffing.
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People can be qualified to do things without those things being in their job description. In the construction realm that I do a lot of work in, everybody is qualified to do demolition cleanup - you have to do emergency removal if a wall falls down on somebody and you need to remove debris.
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Sure, but the job description for train operator doesn't specify by type. They don't have job descriptions for diesel operators and electric operators. It's just "train operator" and the job description explicitly includes both passenger and non passenger trains.
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But you can't ask a carpenter to do debris removal in non- emergency situations because that's not their job, and if you do ask them to do it, you have to pay extra for that out of title work.
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