My favourite loco sound has to be the Class 50 and for high reving its predecessor the good old western class 52 and the unique deltics are hard to beat.
Re the 45/1, I don't know much about them, but superchargers are often linked to the sound you discribe (my Hunslet loco has this trait (Rolls royce supercharged engine)) but I don't know if the 45/1's had them fitted.
Regards
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