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Moving npc personality core?

I have been mapping alot in hammer but i could'n just find a way to make wheatley or the corrupted cores to move on a rail. For example in the portal 2 game in chapter 5 when wheatley guides you throught the facility and hes on a rail. Anyone know the answer.

parent the core to a func_tracktrain following a set of path_tracks :)

Thanks mate, that worked out!:D