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There was an article in, I think, a recent copy of the Railway Magazine which tried to unravel all this. Sadly I haven't read it, just skimmed through. Tractive Effort is not always a reliable guide as it is a mathmatical formula. In theory, comparing TE, a GWR King should be as powerful as a LMS Duchess. In real life this just isn't the case. Draw Bar Horse Power is more reliable and is measured in real life testing. To the best of my knowledge the highest figure ever recorded was for a Duchess. I am writing all this off the top of my head as I do not have the time to do the reseach to back it all up.
However I am sure that I will be corrected if this is all total rubish!
Best wishes,
John H-T.
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