This Athearn ATH87326 HO scale model is the SD40 ATSF Santa Fe #5019, equipped with DCC and Sound Tsunami2. The SD40 series locomotive has many great features. It offers bi - directional LED lighting for visibility, coupler cut levers, rubber MU hoses, and an exhaust stack. There are also fine - scale handrails, photo - etched stainless steel windshield wipers, and separately applied wire grab irons. The see - through dynamic brake, radiator fans, and cab windows add to its realism. It has a frame - mounted bell, a detailed 4,000 - gallon fuel tank, and Flexicoil - C trucks. The McHenry® scale knuckle couplers are Kadee® compatible. All - wheel drive with precision gears ensures smooth and quiet operation, and all - wheel electrical pickup provides reliable current flow. The DCC - ready version features Quick Plug™ technology, and the non - sound version has a 21 - pin NEM DCC plug. The wheels with RP25 contours work on all popular track brands. It has a highly - detailed, injection - molded body, painted and printed realistically. It's fully assembled and ready to run, with window packaging for easy viewing and an interior plastic blister for safe storage. The minimum radius is 18 inches and the recommended radius is 22 inches. New features include a more powerful and quieter can motor, Tsunami2 sound with dual cube speakers in DCC & sound models, and long - lasting LED lighting. Sound - equipped models come with an onboard Tsunami2 DCC/Sound decoder, dual cube speakers for great sound quality. They can operate in both DC and DCC, with engine, horn, and bell sounds working in DC (though some functions are limited). All functions are NMRA compatible in DCC mode. You can control lighting functions with F5 and/or F6, and it has excellent low - speed operation. You can also program a multiple unit lash - up. Many functions can be changed via Configuration Value (CV) changes, and a CV chart is included. The SD40 prototype was introduced in 1966, powered by a new 645 diesel engine with 3,000 hp. A total of 856 were built for American railroads, 330 for Canadian, and 72 for Mexican ones.

Using this model is quite easy. It's fully assembled, so you can take it out of the window packaging and place it on your track right away. Make sure the track radius meets the minimum requirement of 18 inches, but 22 inches is recommended for better performance. If you're using a DCC system, connect it using the Quick Plug™ technology or the 21 - pin NEM DCC plug for the non - sound version. In DC mode, you can still enjoy basic functions like engine, horn, and bell sounds. When operating, use F5 and/or F6 to control the lighting functions. You can program a multiple unit lash - up with the lead unit having horn, bell, and lights control. To change some functions, refer to the CV chart included in the box and make Configuration Value changes. As for maintenance, keep the model clean. You can use a soft brush to remove dust from the body, handrails, and other detailed parts. Store it in the interior plastic blister when not in use to protect it from damage. Also, check the wheels regularly for any signs of wear or dirt, and clean them gently if needed.