Walthers PROTO 2000 HO Scale Diesel EMD F7A-B Set Powered - Standard DC - Baltimore And Ohio #4546 And #5453 14:1 gear ratio for easy multiple-unit operations Helical gears for ultra-quiet and smooth running Five-pole, skew-wound, high torque, high efficiency can motor Road-specific horn, spark arrestors and other roof details Working headlight w/bezel and recessed lens