SD45 6681 (Frisco 933) by Frisco.org Posted on March 23, 2016 SD45 6681 (Frisco 933) SD45 6681 (Frisco 933) (location unknown) in February 1981. Posted in BN Patched, RT Collection | Tagged 6681, 933, Electro-Motive Division, SD45 | Leave a comment