SW1500s 343, 318 and 21 (Frisco 316) by Frisco.org Posted on February 16, 2018 SW1500s 343, 318 and 21 (Frisco 316) SW1500s 343, 318 and 21 (Frisco 316) at Memphis, Tennessee on December 13, 1980 (David Johnston). This entry was posted in BN Patched, Slides and tagged 21, 316, 318, 343, Electro-Motive Division, SW1500. Bookmark the permalink.