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Link copy number to moving object

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Hi, I'm new to Houdini and there is basic stuff that I can't wrap my head around. I want to animate a railroad appearing below a moving train, and the easier way that came to mind is using the copy and transform node, by animating the total number. But this doesn't seem the best way and as soon as I change the train animation the railroad gets ahead or behind it, so I was wondering would the best way would be.

 should also export everything to Unreal, but the alembic of the animated railroad isn't working, probably because of it gradually appearing, so if you happen to know how to make it work I would really appreciate it. Thank you in advance!



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