Forney rear truck derailing

[locoron]

locoron

The rear truck on my Forney derails at random locations.  Have checked track gauge and level.  Lead and trailing trucks on all other engines have no problem.
It has a 100% problem on a right hand turnout. As it goesthru to the right the trailing truck follows the straight path.
Drat, this is the passenger engine and service is seriuosly disrupted.
Any ideas?
   Thanks  Ron

[Dusten Barefoot]

I think your switch ain't switched all the way, there might be something between the rail and the switch rail. Clean off any dirt, or anything that might be in between the rail and switch rail. I have had this problem before, and could not figure it out until I got close down to where my eye was touching the rail, to see what the problem was.
I hope this helps
Dusten