I've often tried comparing steam and modern traction myself but never come to any real conclusions. If you look at "Tractive Effort" figures even the smaller diesels and electrics appear to be much higher than most steam locos but I don't think it can be as straightforward as that.
Maybe Alan (Locojoe) can give us his impression of how the prototype Deltic and the English Electric Type 4's compared with the ex-LNER Pacifics?
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