Santa Fe SD-90-MAC Diesel Engine w/Proto-Sound 2.0

Serious efforts to use AC (Alternating Current) diesel-electric engines began when General Motors introduced its 4000-horsepower SD-60MAC in 1991-92. While the AC power increases an engine's adhesion, allowing it to start far heavier trains than a DC-powered locomotive of the same horsepower, the heavier load prevents AC-powered engines from reaching track speed. To solve that problem, locomotive builders have raced to design and deliver AC engines with ever-larger horsepower. SD90-MAC's use a whopping 6000 horsepower to power their freight down the rails.

- Directionally Controlled Headlight - Intricately Detailed ABS Body - Colorful Paint Scheme - Precision Flywheel Equipped Motor - Metal Wheels, Axles and Gears - Die-Cast Truck Sides, Pilots and Fuel Tank - (2) Remotely Controlled Proto-Couplersr - Metal Chassis - Metal Handrails and Decorative Horn - (2) Precision Flywheel Equipped Motors - Locomotive Speed Control - Proto-Sound 2.0 With The Digital Command System Featuring:- Freight Yard Proto-Effects - Unit Measures:14 5/8 x 2 7/16 x 3 5/8 - Operates On O-31 Curves