I’m by no means an engineer. In the video where the trucks derail on an 072 curve. These are not your standard freight car trucks. The wheelbase between the axles is quite a bit longer. Passenger car like. Most passenger cars seem to have either a coupler that pivots on the truck or body mounted couplers so the truck is free to navigate the curve.
These cars could stand some weight. At least bring them up to the heft of an Atlas with a die cast chassis.
Someone with a 3D printer or good at designing such as Mario. Could probably come up with a replacement for the Lionel coupler shank that you could mount a Kadee to. For those not wanting to body mount them. I switched to them years ago and haven’t looked back. But I realize they are not for everyone and for what your paying. They should run fine out of the box.
I recently purchased 2 older issue Milk Cars pretty cheap. No boxes. The sole purpose was just for the trucks for a couple projects. The price on the secondary market will probably bump up for those looking to upgrade to something built in the early 2000’s.
