I am trying to make a consist of flatcar container carriers. After placing the containers on the flatcars, they do not stay on when the train begins to move. Thre must be a way to have the containers attach to their flats. I found a consist on the a loaded route where the author has a train with a consist that works fine. I copied the train into the consists area but the flatcars are empty when I place the consist into a different route. Help me please.