Probably should let the 'Steam Men' like Derek and Brandon field this. But just quickly looking at the Scotsman ENG.sms, I see it's Injector Volume is pretty low at ( 0.25 ). Try making it ( 1.0 ) and see if that helps?
Also, in looking at the WAV itself, I see Kuju had used 'Loop Points' as opposed to 'generic Cue markers'. From what I understand, Loop Points still don't work in Open Rails. So that maybe another issue there?
Not the most conclusive, but a better answer than Sir George Martin could ever give.
