HO GEN SD90MAC Locomotive NS 'Ex-CIT' #7331 (ATHG-1922)

HO-scale Norfolk Southern Ex-CIT EMD SD90MAC diesel locomotive, number 7331, in the Athearn Genesis line. This highly detailed, ready-to-run HO model reproduces the prototype’s power, profile, and NS paint scheme, giving model railroaders a standout locomotive for their layouts.

Built for authentic operation, the locomotive combines a heavy die-cast frame with a Genesis drivetrain—featuring a 5-pole motor, precision flywheels, and a multi-link drive for smooth, quiet pulling power. It includes LED lighting with lit number boards and truck lights, a full cab interior, etched see-through steps, windshield wipers, and scale handrails, plus body-mounted knuckle couplers for a realistic coupling appearance. DCC-ready with Quick Plug plug-and-play technology and a 21-pin NEM connector makes digital control straightforward, and RP25 wheels plus all-wheel electrical pickup keep performance reliable on HO track. Road-number-specific variations and nose-door options reflect NS Ex-CIT history, while features like ditch lights and front/rear walkways enhance prototype detail. Fully assembled and ready to run, it carries a minimum radius of 18 inches and is best on 22-inch curves or larger for smooth operation.