The Athearn ATH73734 SD40R HO scale model represents the Southern Pacific's rebuilt SD40 locomotives from 1980 - 1981. These units were upgraded to Dash - 2 electrical standards and got air filters for the electrical cabinet on the fireman’s side behind the cab. They were numbered in the 73XX series. Some units sported the eye - catching red - and - yellow paint scheme of the proposed Southern Pacific Santa Fe merger, which combined SP scarlet with ATSF yellow. Even though the merger was denied in 1986, these repainted locomotives were in service on the SP until the 1990s. In 1966, EMD introduced new locomotive models with the 645 diesel engine. The SD40 had 3,000 hp from a turbocharged V16. It was widely used in American, Canadian, and Mexican railroads. This model comes with many features such as LED lighting, photo - etched stainless steel windshield wipers, and separately applied wire grab irons. It also has a DCC - ready design with Quick Plug™ technology and 21 - pin NEM connector. The sound - equipped models offer SoundTraxx Econami sound, a single cube speaker, and operate in both DC and DCC with various functions.

Using this HO scale locomotive model is easy. First, check that all parts are properly attached and in good condition. If you're using DC power, you can enjoy basic functions like engine, horn, and bell sounds. But remember, some functions are limited in DC. For a full - fledged experience, use DCC power. You can then take advantage of all the NMRA - compatible functions. To set up the DCC, connect the locomotive using the 21 - pin NEM connector with the Quick Plug™ technology. You can program a multiple - unit (MU) lashup with the lead unit controlling horn, bell, and lights. When it comes to storage, the interior plastic blister safely holds the model. Keep it in a dry and cool place to prevent any damage. For maintenance, clean the locomotive gently with a soft, dry cloth. Avoid using harsh chemicals as they may damage the highly - detailed body. Check the wheels regularly for any dirt or debris that might affect its smooth operation. If you notice any loose parts, secure them carefully. Also, make sure the track is clean and in good condition as the wheels with RP25 contours operate best on well - maintained tracks. With proper use and care, this locomotive model will provide you with a long - lasting and enjoyable experience.