Santa Fe O Gauge RailKing SD90-MAC R-T-R Train Set 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. Locomotive Measures Approximately: 14 1/2" x 2 1/2" x 3 1/2" Cars Measure Approximately: 10 1/2" x 2 1/4" x 3 1/2"

Set Features - Two-Motored Diesel Locomotive - 3-Car Freight Consist - 31" x 31" 8-Piece RealTrax Circle - RailWare Interactive CD Rom With Track Layout Software - Infrared Track Lock-On - 75-watt Power Supply With Wireless Remote - Quick Start Video Locomotive Features - Durable ABS Body and Metal Chassis - (2) Flywheel Equipped Motors - Locomotive Speed Control - Electronic Reverse Unit - Operating Headlight - All-Metal Wheels and Gears - Loco-Sound Sound System with Diesel Roar, Horn and Bell Sounds Freight Cars Feature - Intricately Detailed Durable ABS Bodies - Die-Cast 4 or 6-Wheel Trucks - Operating Die-Cast Metal Couplers - Colorful, Attractive Paint Schemes - Fast-Angle Wheel Sets - Needle-Point Axles - Metal Wheels and Axles