I believe the new stock cars still have the old ones too - buy with confidence. I wonder why they were spared?
Because the vision cars have an angle sensor. The mounting hole on one of the trucks is D shaped instead of round so that the sensor can be mounted to the top of a shaft inside the car.
Beer cars use the sheet metal sprung trucks too. I never tested the couplers because I just cut em off and put on kadees, but they didn’t look like the older couplers.
Im sure there’s a rhyme and reason for what’s getting what, probably the factory that makes them, but going forward it sounds like if you “gotta have” a lionel car you need to factor the cost of putting Atlas trucks on it.