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I've had problems with as few as 6 cars backing over turnouts, but these were N scale Peco #4 frogs (i know better now). Had to take a dremel with a sanding disc to trim the frogs to make them work; if you try a NMRA track gauge they don't make it through the Peco #4 Electrofrog left or right hand versions. The Y version seems OK. Now i stick with Peco #6 electrofrog - much better, but check for vertical bending at the point/stock rail contact area and straighten if required b4 installing. And it doesn't hurt to bevel the frof end slightly with a file and adjust the points so they angle very slightly towards the stock rails. <br /> <br />Where truck mounted are a problem is if the turnouts are less than perfect, the backing force on a truck mount coupler tends to twist the truck sideways. If there is any posibility of the flange picking an irregularity, it will!
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