How can I script a Camera button to work for everyone?

I was making a camera where you can view your train from different angles. It worked, however you could only see the first train that was spawned in the game. I don't know why and I can't fix it.

local CameraViewButton = script.Parent
local Camera = game.Workspace.CurrentCamera
local CameraView = 1
local TrainSeat = game.Workspace.Model.C153.C153.MachinistSeat
local Seat = game.Players.LocalPlayer.Character.Humanoid.SeatPart

function ChangeCamera(View)
    if View == 1 then
        game:GetService("RunService"):UnbindFromRenderStep("UpdateCamera")
        Camera.CameraType = "Custom"
        Camera.CameraSubject = TrainSeat
    elseif View == 2 then
        Camera.CameraType = "Watch"
        Camera.CameraSubject = TrainSeat.Parent
    elseif View == 3 then
        Camera.CameraType = "Scriptable"
        game:GetService("RunService"):BindToRenderStep("UpdateCamera", Enum.RenderPriority.Camera.Value - 1, function()
            Camera.CoordinateFrame = CFrame.new(Seat.Parent.Poles.Position) * CFrame.Angles(math.rad(0), math.rad(Seat.Parent.Poles.Orientation.Y + 30), math.rad(0))
        end)
    end
end

function ChangeCameraView()
    CameraView = CameraView + 1
    if CameraView == 4 then
        CameraView = 1
    end
    ChangeCamera(CameraView)
end

CameraViewButton.MouseButton1Click:connect(ChangeCameraView)