Radius


Wide as you can fit in the given space..But do know that the very longest rigid frame engines, especially those with swiveling trucks (diesels/traction) can and have to go through most yard and roundhouse track or they wouldn't exist...Is this Z scale ? Ouch !!
 
Usually the mfg'r will say minimum radius on the instructions,
Best I can say is take a length of flex and experiment with it.
I really know very little of Z scale. Heck, I can hardly see it!
 
Ask a guy goes by the handle of "HOexplorer". He has built a few Z scale layouts - send him a private message, or ask on his THREAD --
Building the Pinnacle Creek Mining & Timber Co. RR
 



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