Plarail Line 0 Inside Curved Track

I think we may have talked about these recently in one of Vio's vintage Threads. 

Exactly. There's life in the old coot yet. All the detail you need is in the Vio's Collection So Far thread, starting about here.  

And the link Vio posted there, to Plarail current part dimensions inherited from the official use of "Large Curved Rail"