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Steam locomotive crosshead guide(s), Single vs Double?

Someone once told me that speed was a determining factor but I tend to disagree as there are examples of both types in slow and high speed service.  One interesting example is the N&W J class which I believe used a single for the first five (600-604) then two thereafter on what was arguably the most powerful 4-8-4 ever.  My best guess would be that is has something to do with reduced friction/improved fuel economy but I honestly don’t know.  Can anyone knowledgeable shed some light on this?

Thanks

Last edited by PRR 5841
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