30 Long O Scale. Model Train Display Case with Walnut Base. This hand crafted display case features an acrylic cover that is 30″ long by 4″ wide and 6 tall on the inside. The base is walnut with a polyurethane finish that has a 31″ X 5″ footprint. Please note that the actual color of the base will vary from case to case. Train and track are not included, for display purposes only.