Has anyone fitted Kadees to Eureka's 623/723s?
I am having derailing problems when pushing trailer car and suspect the existing couplers.
I have removed one concertina section and also played with extending the exisiting coupler as it appeared that the power coach was touching the unpowered and it has not made any difference, back to back are OK.
What radius of curve are you using? (Or angle number of turnouts?)
They can't take 18" radius, I've tried it...
It will run on 18" radius with the couplers not mated, giving a greater distance between the cars.
(I did this to demonstrate the cars away from home on the only sectional track I had...)
The reason the problem is worse pushing is that the coupler distance closes up when pushing.
Longer shank couplers should work.