05-20-2010, 10:11 PM
If all of the Peco turnouts result in derailing, it is probably not a result of turnout bending or twisting. It could be guard rails set too wide as well. I forgot to mention that possibility. Atlas turnouts in HO scale are famous for having the guard rails too far from the rails, so that they just don't serve any function. The guard rail opposite the frog on both diverging tracks should restrict side to side movement of the wheels to keep them properly railed all the way through the frog and out the other side.