In my opinion Atlas 3 rail is the high rail equal to Micro Eng two rail for being stiff. I had earlier been staggering Atlas two and three rail O at least 12" for each rail. I had been sliding out rail, prebending, dressing up the ends and reinserting the rail for several years now
I have not laid any Atlas 3rail since getting my new rail roller which should simplify the process considerably. I do know that Atlas has used this rail bender with great success on their three rail flex.
With the flex track rail bender I no longer need to stager the curved rail joints. Much quicker,simpler, smother curve IMO.
I have used this flex track bender from Norm's Model Supply www.choochoostuff.com
Norm's flex track bender has totally revamped my flex track installations, Even curved MTH Scale Traxx to about a 12"radius for JusTrains awhile ago. Perfectly even with no kinking whatsoever.
Total time to set a perfect curve in any piece of flex track takes less than one minute.
Just finished installing about four cases of Atlas flex, whole new ball game.