How to follow carriage train to engine using iTween and their path

You could use hinge joints.

• Add rigidbody to engine and set

  • useGravity = false

  • use kinematics = true

  • if needed add xz-rotation constraints

• Add Rigidbody to the carriage and set

  • useGravity = false

• Add a hinge joint to the carriage and set

  • connectedBody to the engine

  • Adjust Anchor and axis (axis should be (0,1,0) so the arrow is pointing upwards)

  • Use Limits = true

  • MinLimit = -20

  • MaxLimit = 20

With this you could connect more carriages, just set the next connectedBody Rigidbody to the previous one.

Apologies for errors because I posted this from my mobile phone.