HO GEN SDP45 Locomotive EMDX 'Demonstrator' #4355 (ATHG-2009)

HO-scale SDP45 diesel locomotive in the EMDX Demonstrator livery. This faithful HO model recreates the SDP45 prototype that replaced older E-units for passenger service in the 1960s, and it’s offered in Athearn’s Legendary Liveries as an exclusive, historically inspired paint scheme. The Demonstrator edition provides a distinctive roster piece that’s ready to run on a standard HO layout right out of the box.

Built for reliable, smooth operation, the model features a Genesis driveline with a 5-pole motor, precision-machined flywheels, a multi-link drivetrain, and a heavy die-cast frame for traction and durability. It’s DCC-ready with Quick Plug and a 21-pin NEM connector for easy digital control, and body-mounted scale knuckle couplers provide realistic coupling. Road-number-specific variants cover a broad range of schemes—SP, BN, GN, UP, SP Daylight, HLCX, NYC, and more—while RP25-contoured wheels ensure smooth operation on standard HO track. The minimum radius is 18 inches (22 inches recommended), and Tsunami2 sound-equipped versions add authentic engine, horn, and bell sounds for a complete model railroad experience.