Britains most powerful express locomotives were Sir William Stanier's Coronation class pacifics.
With a heavy Scotch express they could crest the summit at Shap at about 15mph...and that was with the help of a banking engine pushing from Tebay.
When the class 81, 25KV electrics were introduced around 50 yrs ago, the same train was going over the summit at 90 mph with no second engine.
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Impressive ?
Ted
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