How can I move a player on a tweened object?

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I use this script sometimes created by @nooneisback

Anyways. Make a folder full of the moving parts and put the folders place in Whitelist

-- Localscript inside of StarterCharacterScripts

local Players = game:GetService("Players")
local player = game.Players.LocalPlayer
local RunService = game:GetService('RunService')

local LastHit
local LastTrainCFrame

local Function
local Function2

local Whitelist = {workspace.Trains}

Function = RunService.Heartbeat:Connect(function()
	local RootPart = player.Character.HumanoidRootPart
	local Ignore = player.Character
	local ray = Ray.new(RootPart.CFrame.p, Vector3.new(0,-500,0))
	local Hit, Position, Normal, Material
	if LastHit then
		Hit, Position, Normal, Material = workspace:FindPartOnRayWithWhitelist(ray,{LastHit})
		if not Hit then
			Hit, Position, Normal, Material = workspace:FindPartOnRayWithWhitelist(ray,Whitelist)
		end
	else
		Hit, Position, Normal, Material = workspace:FindPartOnRayWithWhitelist(ray,Whitelist)
	end
	if Hit then
		local Train = Hit
		if not LastTrainCFrame then
			LastTrainCFrame = Train.CFrame
		end
		local TrainCF
		if Train ~= LastHit and LastHit then
			TrainCF = LastHit.CFrame
		else
			TrainCF = Train.CFrame
		end
		local Rel = TrainCF * LastTrainCFrame:inverse()
		LastTrainCFrame = Train.CFrame
		RootPart.CFrame = Rel * RootPart.CFrame
		LastHit = Train
		if Train ~= LastHit then
			LastTrainCFrame = Train.CFrame
		end
	else
		LastTrainCFrame = nil
	end
	
	if not Function2 then
		Function2 = player.Character.Humanoid.Died:Connect(function()
			Function:Disconnect()
			Function2:Disconnect()
		end)
	end
end)