The Cambrian Line is fascinating- lovely scenery and great modelling opportunities. My ambition is to model the triangular Barmouth Junction ( now mostly disused and called Morfa Mawddach). I think in OO I could fit it into a 10ft by 4 ft space using Hornby 2nd radius. Has anyone out there tried it? If you want more information try "The Coast Lines of the Cambrian Railways" volumes 1 and 2 by C.C Green. Volume 2 covers the northern branch to Barmouth Junction. Sadly the writer died before writing Volume 3. The books are not cheap (about £25), but are large with lots of detail about operating practices, original photos and really detailed track and signalling plans. A real collectors item and still in print. We holiday in the area every year and always have a ride down the coast- even on a modern DMU it's a great trip!