What's your minimum radius? And why?

My minimum radius is 1.4m because I have dual gauge track so I can run my 0 gauge outside.
Unfortunately at one end of the line the radius for the return loop needed to be reduced to 0.8m due to space constraints, at this end my 0 gauge, and any visiting stock which can't handle the tighter radius need to run round their train before heading back down the line.


David
 
For space reasons my curves are all LGB R1. it does cause a few problems on the rack section which is twisty goes uphill and is cambered, so there are restrictions w.r.t. what stock can run over it. There are also a few spots where a curve and a change of height cause the 4/4 IIIs problems as the bogies can pitch to the same degree as the 4/4 IIs, the Crocodile or the Bernina railcar.
 
I am laying track right now, R of 800-900mm or more on curves and R2 points on passing loops. All sidings and terminus station will be R1 points and curves to save space.
All trackwork is level (within a few mm), no change of heights.
I have only had a chance to do limited testing so far. Will mainly be running LGB modern RhB trains.
Time will tell if its ok.
 
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In the main R3 or larger, except in the MPD and the shed, I suppose in prototype fashion, but there is a compound R1-2 ish curve in the station area for space constraints.
They look better with bogie stock and locos, but it's a personal preference.

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