O Gauge RailKing 4-4-0 General Steam Engine w/Proto-Sound 3.0 -- Intricately Detailed, Die-Cast Boiler and Chassis. Intricately Detailed, Die-Cast Tender Body. Colorful Paint Scheme. Die-Cast Locomotive Trucks. Metal Handrails, Whiste and Bell. Metal Wheels and Axles. Remote-Controlled Proto-Coupler. Prototypical Rule 17 Lighting. Constant Voltage LED Headlight. Powerful Precision Flywheel-Equipped Motor. Synchronized Puffing ProtoSmoke System. Locomotive Speed Control In Scale MPH Increments. Wireless Drawbar. Onboard DCC/DCS Decoder. Near-Scale Proportions. Proto-Sound 3.0 With The Digital Command System Featuring- Freight Yard Proto-Effects. Unit Measures: 17 1/2" x 2 5/8" x 4 1/4". Operates On O-31 Curves.