I have been looking at @S. A. C. Martins discussion of Thompson, in particular over the P2's & a mention of the GWR 47XX's So why exactly were the only Briish 8 coupled loco's with a very few exceptions heavy freight 2-8-0's? There were the GWR 47xx's - all 7 of them. By all accounts very good machines but with very limited route availability. The 2 P1 2-8-2's. Again excellent machines but it seems far to powerful to be much use. Then there were the P2's, and I wont go there. Certainly the SDJR 7F's acquitted themselves well on passenger trains & many 8F's had dynamic balancing that allowed them to work at up to 60mph. I have seen a photo of a 8F on a 'main line' passenger train at Dawlish of all places. But nobody built a 'series production' mixed traffic/express 8 coupled loco. All the mixed traffic/express loco's were 6 coupled, as indeed were the 'fast freight' loco's - Granges, LNER Moguls S15's etc although many 8 coupled mixed traffic/express loco's were built for export. Was there no need for fast 8 coupled loco's or was there some other factor peculiar to theUK?