The Athearn ATH73735 SD40R is a remarkable HO scale model train. In 1980 - 1981, the Southern Pacific rebuilt their SD40s to Dash - 2 electrical standards. These units got electrical cabinet air filters on the fireman’s side, behind the cab, and were numbered in the 73XX series. Some units sported an eye - catching red - and - yellow paint from the proposed Southern Pacific Santa Fe merger. Though the merger was denied in 1986, these repainted units remained in service until the 1990s. In 1966, EMD launched new locomotive models with the 645 diesel engine. The SD40, with a turbocharged V16, had 3,000 hp. Many were built for American, Canadian, and Mexican railroads. This model has great features like LED lighting, photo - etched stainless - steel windshield wipers, and separately applied wire grab irons. It has a highly - detailed body and all - wheel drive for smooth operation. The sound - equipped models come with a DCC decoder and SoundTraxx Econami sound, offering excellent sound quality and various functions.

Using this Athearn HO scale SD40R model train is a breeze. First, you can set it up on your track. Make sure the track has a minimum radius of 18 inches, though a 22 - inch radius is recommended for better operation. If you're using DC power, the engine, horn, and bell sounds will work, but some functions are limited. For full functionality, use DCC. To connect to DCC, use the Quick Plug™ plug - and - play technology with the 21 - pin NEM connector. When storing the model, the interior plastic blister keeps it safe. As for maintenance, keep the model clean. You can gently dust it with a soft brush. Check the wheels regularly to ensure they roll smoothly and are free of debris. The RP25 - contoured wheels work on most popular track brands, but make sure the track is clean too. If you want to change functions, refer to the CV chart in the box to make Configuration Value changes. With proper care, your model train will give you years of enjoyment.