Currently, I'm using the dummy knuckle couplers and have converted any cars that had the old Rapido's...

I started my set with "The Yard Boss", and the beginner set came with 12" radius (24" diameter) curved track and I have stayed with this radius thruout the set-up...

The only place I have any reverse curves is on one switch (turn-out) track. Oddly enough, it does NOT derail there...

It does not seem to matter what car follows the tender as this was my first hope for a quick fix. Sadly, whatever car it is will be the one to derail. I will try the weights...

Thanx to all for your time and effort, I look forward to more help...

I recently purchased a Chesapeake and Ohio engine and tender... The coupler is attached straight to the tender and not the truck of the tender... This causes the car directly behind the tender to be pulled off the track when going into a turn... What can I do to fix this problem???