With all the recent discussions on the accuracy, or not, of some recent diesel locomotive models, I had a look at some details of the Class 47.
One thing I can't work out is exactly how the compensation arms on the bogies are fitted. The outer ends of the links are obviously coupled to the underside of the outer axleboxes, but what happens to the inner ends of the arms - are they coupled to the underside of the centre axlebox, or to a point on the side frames beside the centre axlebox.
I'm using the late Monty Wells' article in MRJ63 as my main source of information where he supplied two excellent series of photos of the bogie sides, but in both series of pictures, the inner ends of the arms are hidden and it is impossible to deduce what happens with them..
Having looked at other Brush six wheeled bogies, as fitted to Class 31 locos, there the compensation arms are shaped to act on the top of the axleboxes and the inner ends both bear on the top of the centre axlebox, so I assume that the same principle applies on the Class 47 bogies.
As an aside to a matter discussed a week or so ago, Steve Jones might want to look at these series of photos, especially at the joins, and see the amount of horizontal distortion that can happen with photographs which are taken 'straight on' to the subject