The Athearn ATH73733 SD40R is a high - quality HO scale model train. In 1980 - 1981, the Southern Pacific rebuilt their SD40 locomotives to Dash - 2 electrical standards and added electrical cabinet air filters on the fireman’s side behind the cab. These units were numbered in the 73XX series. Some were painted in an eye - catching red - and - yellow scheme for a proposed Southern Pacific Santa Fe merger, which, though denied in 1986, saw the repainted units 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, with many built for American, Canadian, and Mexican railroads. This model comes with great features like LED lighting, photo - etched stainless steel windshield wipers, and separately applied wire grab irons. It has a highly - detailed, injection - molded body and operates smoothly and quietly. The sound - equipped models offer realistic engine, horn, and bell sounds.

Using this Athearn HO scale model train is easy. First, make sure your track is properly set up and the connections are secure. If you're using DC power, you can enjoy basic functions like engine, horn, and bell sounds. But for full functionality, use DCC power. With DCC, you can program multiple unit lashups and access all functions. When storing the model, keep it in the interior plastic blister to protect it. As for maintenance, regularly clean the wheels and electrical pickups to ensure reliable current flow. Avoid rough handling as it has delicate parts like the photo - etched windshield wipers and wire grab irons. If you want to change functions, refer to the CV chart included in the box.