Santa Fe transfer/road switcher 2611 was a rebuilt from Andy/1A booster. Available as a 3D print from ATSF N Scale Models and/or directly from Shapeways. Go to the website WWW.ATSFNSCALEMODELS.COM for details on history, building instructions and ordering options. This shells is designed to ride on a custom built chassis (a limited number available of Samhongsa EMD FT trucks/motor drivetrain) or modified EMD diesels with Blomberg trucks. The model can be operated in DC, DCC and DCC/sound, using the decoder of your choice.