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I created a very simple railroad using an array-modifier followed by an curve-modifier, after that I wanted to run a train on the railroad. The Locomotive is consisting of several grouped objects which can be moved as a whole.

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When a add another curve modifier to the groups parent all other grouped items stay in their previous location.

How could the group be moved along the curve?

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It seems you have added a curve modifier which will 'bend' the object along the curve.

What you want to do, is to go to the Constraints-panel and add a Follow Path constraint to the parent. From there you can tick Follow Curve and press Animate Path to make the train drive along the rail.
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  • $\begingroup$ You forgot to explain why the other objects are staying on the initial position: Just parent the other objects to the Locomotive! $\endgroup$
    – Polosson
    Aug 21, 2013 at 9:02
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    $\begingroup$ I understood that the objects already had a parent from the question, but I just edited in that the constraint should be added to the parent. Thanks. $\endgroup$
    – Wedel
    Aug 21, 2013 at 9:26
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Objects in groups don't move together like in 3D Max. You have to parent the objects:

  1. Select all the objects that need to move together.
  2. Select the parent (the one guiding the rest) a second time (holding shift).
  3. Ctrl + P -> Set parent to Object (Keep transformations)
    • Alt + P = Clear parent

The "Keep transformations" part is so the object stays in place (an issue with world / object space).

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    $\begingroup$ They'll move together if you use a Group Instance. $\endgroup$
    – Aldrik
    Aug 21, 2013 at 23:58

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