pick up your monitor and start walking left or right :). really though we would need more information to give you a good answer. for starters are you talking about moving an image or are you planning to make a similar setup with meshes? does it need physics interaction or can it just move on rails? do you want it to swing like a wreckingball or is it just meant to move along like a chairlift on a wire? theres probably many more aspects to consider but this should be enough to show more info is needed.
, am sorry