Hi, I'm having a problem too with the park royal coach bogies not being able to swing enough to negotiate some of the curves. It seems to be catching on the coupling mechanism with some of the curves on the layout, and derailing. I have similar problems with the bogie fouling on the curves on two northern Ireland coaches. All the other coaches that I have, Murphy, silver fox, converted hornby, bachmann, when run fast, slow, reverse ,forward over points on different curves doesn't seem to have this problem. It's a pain in the a**e to be honest.