Question re 6-wheeled trucks/bogies

[RobertInOntario]

Over the past 7-10 days, I've had a lot of success in resolving these problems. These CN coaches seldom derail -- although they're still the quirkiest of all my coaches but are running much better.

Also, I've been resolving the uncoupling problem by making a note of which cars and couplers cause problems and then just simply gradually replacing their knuckle couplers with new ones. In most cases, I believe I'm replacing the Athearn imitation ones with genuine Kaddees, although I did have to replace one Kaddee that was causing problems.

I still haven't had much luck finding the new Kaddee "tight lock" couplers. I asked at one of my LHS's and they hadn't heard of them -- maybe they're known by another name? I'd still like to get some as they could really help as my layout has fairly tight curves.

Thanks for your help here,
Rob