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[quote user="timz"] [quote user="Bucyrus"]Well are we only comparing individual locomotives to see which one does what?  Or are we comparing locomotives to discover some fundamental difference between steam and diesel locomotives?[/quote]Any way to do the latter without first doing the former?[/quote]No, you have to do the former to do the latter, but you can do the former without doing the latter, which is what I meant.  If you are not concerned about a fair test, I think you would have to stop after doing the former. This is regarding your earlier comment: "Sounds like you're at a dead end. Far as I'm concerned you're worrying too much about making your comparisons "fair". Go ahead and make the comparison, doing your best to make it fair; if somebody says it's unfair, leave it up to the reader to decide."I thought the whole point of a comparison was to prove something rather than to just leave the conclusion to the eye of the beholder.
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