the 1948 interchange trials actually proved not much. Apart from provide much argument in gricer circles then and ever since who claim the results were doctored.
They did lead however to standardisation. And probably the best locos BR ever had. The standard 5's 7's & 9's
The Black 5's, the Britannia's, and the 9F's (basically hybrid LNER & LMS designs - none of that GWR s***)
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