ATSF F3 #31LABC. Built by EMD October 1948/January 1949 as an F3A/F3B combination. Delivered to ATSF shortly thereafter in red and silver short warbonnet with horizontal slit grilles, low db fans, and stainless steel panels. Vertical slit stainless steel grilles added sometime after 1949. This model shown in red and silver warbonnet scheme. This model received a Certificate of Technical Merit for Motive Power in 2017. Model by Harlan Boyce, SFRH&MS photo.