The Atlas Classic N Scale SD-7 Locomotive is based on the prototype manufactured by EMD from February 1952 to November 1953. Utilizing a 1,500 hp engine and a longer underframe than the GP-7, the SD-7 was the first locomotive to use EMD's Flexicoil truck. Features Include: -Scale Speed motor -New chassis -Powered low friction drive -Blackened metal wheels -Dual brass flywheels -Directional lighting -Golden-white LEDs -New tooling to include body-mounted AccuMate couplers