Train tender just jittering and derailing for driving

Hi devs, I have some questions, how is the locomotive tender while driving? So, if you explain why, it is just weird for a tender one but I’ve tested with Edward’s model to ensure that are wheel is derailed before it could recovered by the player pushed in the side of them. The coupler system uses Ball socket constraints to improve attachment physics for the tender of the locomotive.

So, here is the test video results (Sorry for the lag video):

Because I put the massless glider under a tender, but it didn’t work. How do I solve jittering and derailing tender problems?

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you can make wheels mass larger in property custom physical

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