According to wikipedia, ATSF had DL-107 A units and DL-108 B units.
http://en.wikipedia.org/wiki/Alco_DL109
http://en.wikipedia.org/wiki/Image:Santa_Fe_DL109.jpg
One unit was built in 1941.
http://abpr2.railfan.net/abprphoto.cgi? ... anColl.jpg
http://www.northeast.railfan.net/images/tr_sf50.jpg