Hi -from personal experience I can confirm that the 0-4-0 diesels and both the Bachmann mine/ore car types will run fine on 10 inch radius track (I use pre-formed track by German manufacturer Fleischmann for that radius).   

I've also experimented successfully with kit bogie vehicles from Black Dog Mining Co and Rio Grande models, at least up to a scale 20 feet in length.   In all cases, bogie vehicles use Bachmann bogies/trucks and using Kadee #5 couplers.

Yes please to DCC factory fitted on every locomotive ASAP!

Phone wire works fine for me too.   I believe UK standard wire for this is the same as North America (50 volt carrier), but you may want to check.  Maximum power I've used is around 13 watts (1.1 Amps at 12 volts) with no problems at all.  I'm always slightly sceptical of "requirements" for heavy gauge wiring over reasonable distances.  If you ever get the chance to examine an LGB G scale loco, you'll find the internal wiring gauge is incredibly small, but those locos regularly handle 24 watts per motor (1.5 amps at 18 volts).

Thanks for that - good job I didn't order a Forney yesterday then!   No room for 22 inch curves, so looks like it's back to the drawing board on loco acquisitions.   I wish Bachmann would bring in another diesel model.  Perhaps an On30 version of the double-ended rod drive made in G scale?

Stupendously quick and efficient!   Many thanks to all.  Anyone care to guess about the Forney's abilities?   18 inch radius seems safe....

This is a repeat of a post in the old forum which I can no longer access - apologies if this ends up repeating data.

Does anyone have experience of using Shay or other geared-type locomotives - or a Forney - on curves of less than 18-inch radius?   In particular, anyone successfully using European standard 14.625 inch radius curves?

Thanks for any information.