Mmmm. Stanier's magnificent Coronation class pacifics do it for me. And 9Fs are quite good, too.
Always loved steam locos and been interested in railways generally. Never written down a loco number in me life (or an aeroplane reg.).
But Flying Scotsman? Never understood why it generates such passion. It's just an A3, not even a 'looker'. I think it's that name - makes folk who don't know much about trains go all misty-eyed for the 'golden age'.
It's a 'celeb' loco - famous only for being itself.
SSD