Thanks a lot for your replies! From looking at the video it appears that the Class 37's sounds, which are a bit higher pitched in the doodlebug thanks to the higher RPM setting, fit quite nicely. And one of the F7s' horns could indeed stand in quite nicely for the 'flat' single tone horn.
The brakes, thanks for reminding me! They do need some more work. Judging by the cab photos of the real world MW #31, this car didn't have an independent brake, only a train brake. So this is task one, get rid of the indy brake. Then I'd need to edit the brake parameters for the train brake -- or could it have been the other way around -- only a loco brake, no train brake??? But I doubt this would have been legal in the 1920s. At any rate, the current beta's brake setup is the one from Kali's and my F7s. Which probably needs some adjustments, as I think the doodlebug would have had more responsive brakes -- and I think I'd also need to increase the brake force in general. Does anybody know what the max. brake force (kN) of a real doodlebug might have been like, approximately?
There's another bug that got reported, the TS2012 light beams aren't positioned yet.
Also, the whole car still needs it B-end cab -- is it possible to use the loud sound setup (basically exterior sound set) for cab A, where the engineer practically sits on the engine, and use one of the muted "cab sounds" for cab B only?
Thanks for your help!!!