Switch Derailing

[Ckrails]

Do your locos derail in both directions through the switch or just one?  When installing a new turnout, I find that many of my locos derail going into the diverging route (not straight).  I solve this problem by filing/sanding down both sides of the frog (the pointed plastic piece in the center) no more than a millimeter or so and rarely have a problem after that.
CK

[lamarager]

Thanks.  I'll try it.  The problem has improved but it could get better.