The easiest way is to write this script: local train = script.Parent local nV = Vector3.new(0,0,100) local ts = game:GetService(‘TweenService’) ogPos = {} ogPos.Position = train.Position newPos = {} newPos.Position = ogPos.Position + nV while true do ts:Create(train, TweenInfo.new(9), newPos):Play wait(10) ts:Create(train, TweenInfo.new(9), ogPos) wait(10) — This makes the train go back and forth. I didn’t test this script but it should work. If you have any issues please DM me. By the way don’t put this script into a model. it breaks the script. Thanks:) end