SW1500s 46 (Frisco 341), 40 (Frisco 335), and 21 (Frisco 316) by Frisco.org Posted on November 14, 2016 SW1500s 46 (Frisco 341), 40 (Frisco 335), and 21 (Frisco 316) SW1500s 46 (Frisco 341), 40 (Frisco 335), and 21 (Frisco 316) at Memphis, Tennessee in July 1891 (D.M. Johnson). This entry was posted in BN Patched, RT Collection and tagged 21, 316, 335, 341, 40, 46, Electro-Motive Division, SW1500. Bookmark the permalink.