Rod Constraint causing front train carriage to sink like the titanic

I have a train which is 2 cars long. This issue initially began when attempted to add another train to my game that shares the scripts with this one in a modular OOP system.

After adding my new train this issue began happening.

Here are the things I have tried and didn’t work so far to fix it.

  • Loading an older version of the game without the new train (the bug doesn’t happen then and everything is normal)
  • Completely deleting the new train from my OOP system.
  • Checking collisions between the two trains to ensure the rod isn’t trying to pull them together with colliding parts.
  • Changing the rod distance in the studio playtest
  • Disabling the rod (as shown in the video) (This stops the train carriage from turning on it’s side vertically but the two train carriages are required to be connected)
  • Swapping the attatchments of the rod and changing the rod’s parent to the other carriage. The outcome of this is that the bug still continued in the same way where the front carriage bugged out no matter where the rod is or what attatchment it had.

I’m looking for people to give me ideas on what could possibly be causing this.

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RodConstraint cannot bend
You are looking for rope/spring constraints.

Unfortunately neither of the other options would work for me as rod constraints are my go to and they usually work.