Yes I noticed the coupler "thumb tacks" were loose as well.
I had great performance from one car I purchased, the dome car.
However when I purchase 2 more and coupled them together, that's when all #*&$ broke loose.
The adjustable couple works but it will need some tweaking around the layout.
S curves they hate, and any switch less than O 100 seems to create issues.
The other track item is any up/down transition in the rails has to be so slight, or else the bolster of the truck will bind on the floor or skirts of the car....
On my upper deck, I had to make sure the minimum radius was 096.
To be honest 072 radius for these cars is just pushing the limit of your sanity.
