Separately applied roof walks, ladder, brake wheel & brake lines Accurate painting & lettering See-through roof walks Metal couplers and sprung die-cast trucks True scale dimensions with accurate details Weighted, detailed underframes 2-rail cars feature scale wheels and body mounted scale couplers 3-rail trucks pre-drilled for Adjust-A-Coupler™ System (sold separately) Minimum diameter curve: 0-31 (3-Rail) Minimum radius curve: 24" (2-Rail)