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Atlas #4's are actually close to 4 1/2, and work fine building ladders. The Snap switch you have is designed to make it easy to add an inside oval to an 18" radius curve using snap track, and not very useful for much else. I think you'd be better off with a #4 than try to make adjustments with the snap switches, and probably get better running and fewer derailments. Those are pretty sharp, sharper than #4, I don't know what. <br />That being said, I found out you can build a ladder, of sorts, (using flextrack), with track centers at about 4 1/4", due to the sharpness of the turnout. I'd stick with #4's. I have no experience with Shinohara nor Peco, so I can't help you. If you use Tortoise switch machines, they have contacts to route power to the siding and/or powered frog. <br />Dean
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