If you have trouble with cars becoming uncoupled, you can adjust the coupler height so the weight is slightly above the rail when the car is on the track and the knuckle is closed.
This may occur due to the coupler weight hitting something in the center of the track, like a switch frog, or uneven track work.
Using a pair of long nose pliers, carefully bend the metal portion of the truck that leads to the coupler, as shown in the diagram.
The coupler bottom of the coupler weight should be 1/32'" above the track rail, when the coupler is in the closed position.
Be sure the coupler is square with rest of car.

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