GS4 Fredom Train Derailments

[lirrman]

When backing the locomotive, even through 26" curves, the tender derails. I know the cause but I can't figure out the cure, other than to stop backing up.  The wires connecting the the tender to the locomotive ar too stiff and are basicly pushing the tender off the rails.  Replacing them with more flexible wires is more than I want to tackle.  Any suggestions?
LIRRMAN

[SteamGene]

Try putting as much of the harness in the tender as is possible. 
Gene

[Tylerf]

I had to add weight to the tender of my GS4