Equipped with removable chip board dividers and made from heavy duty 250lb. test, double wall corrugated cardboard. Easy to assemble with instructions included. Boxes have a clean, white exterior. Excess height cars (autoracks, Amtrak Superliner cars, etc) will not fit. Hobby Tote System cases are excellent for carrying long unit trains (grain, cement, intermodal cars) and the locomotives to pull them. Each Low-Sided container measures 27 x 7 x 2-1/4" (interior) and 27-3/4 x 7-3/4 x 2-1/4" (exterior).