dear train friend,based on my little experience,minimum is just that.like someone stated go for072.i run a gunderson set with minimum 054 on 060 switches and it doesn't look so good.I believe bigger radius is less strain on couplers.my main loop is on a 7x8 table with 072 curves.i know lack of space is our enem,if you can put the biggest radii you can.you will be better off in the long run
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