156443
Just seen your message so I hope it is not too late for you to have a look at some of my photos. All the details (shutter speed etc) are listed after every photo and these might give you an idea of what settings you will need for the Flying Scotsman.
Remember however, that the light plays a huge part in getting a decent shot as does the distance you are from the trains.
This shot was taken by my son on a very dull day so we had to knock the speed down due to the cameras we have. However, the locos were belting along and he was lucky to get the shot:-
56303 (1) by
ANDY'S UK TRANSPORT PAGE, on Flickr
However, this one was on a sunny day in February, coming at me full belt and I was using the 'older' camera.
43467 (1) by
ANDY'S UK TRANSPORT PAGE, on Flickr
As I say have a look if you get chance and good luck for the Flying Scotsman.
Andy S