Ron's post above links to a site that uses Radio Contro servo motors.
If you are in the UK, there are several people doing something similar here; they were mentioned last year I think in the Tracks, Layouts, Scenery section. Try using the 'Search' facility of the Forum (right-hand side of header) - that may bring them up for you.
And a belated welcome to the Forum as well.
Regards,
John Webb