Hi Tom,
Not entirely sure what the ruling radius is on the layout actually, Richard Carr would know far better than I, but I know that there is a section of the fiddle yard about half way through the above video where a check rail has been needed, I would say maybe a very brief 6 foot perhaps? Not something that would want a habit making of though..
The L1 is fully sprung. Quite a bit of playing about was needed with the rear bogie springing, due to the frames having correct bearing plates, rather than a giant spring on the pivot, which meant that the bogie wouldn't rock up and down, fore and aft of its centre pivot if that makes sense..?
I've seen very good compensation in the past, but I would say I'm more keen to try CSB in the future.. Watch this space..
I'll try and get some more video next time, but we only meet once a week...
JB.