adrian
Flying Squad
Sorry I missed this thread, been off the grid for a couple of weeks.Rob. On the Sentinel Loco 7109 site there is a side view drawing of the double-ended version.
I'll try the 'address'. It's:
http://sentinel7109.blogspot.co.uk/search/label/Other Sentinel Locos
Agreed a really interesting and informative site, the owner is most amenable to a questions as well. I contacted him about the Y10 drawing he had to see if he had a drawing number for the Sentinel Archives and he sent me a high resolution image, apparently scanned from 1920/30s Sentinel catalogues. It's 1.6Mb (7,000x4300 jpg)
If you want to download it then I've stuck it on dropbox, hopefully permissions are set so you can see it.