Lionel autoracks have been known to be to light. I went to lowes and bought 1inch 10ft pipe. You can buy pipe for 7.18 bucks and get 5 21 inch cuts from it. So about 1.4$ per rack. Also pipe cutters are cheap and easy to use! Most people use model cars but those can be to expensive and also roll around autoracks to much and end up opening the doors.