Train wagon didn't go past through curve track

I builted a curve rail track with an plugin, but the wagon didn’t go past through curve track away. I always show in my video, so watch this:

So, I curved a rail track with an plugin already. But how train wagon go past throught curve track without derailment?

this two images will explain you all

Yes, the train wagon rolling certainly, but not the correct wagon glider. I have shown the rope constraint in the coupling hook, but the size is too small. How can I resize that locomotive can pull with a long-size rope constraint?

wait, where did you show a rope constraint?

There is a rope constraint: