Western Pacific Railroad EMD SW 1200 yard switcher # 606 at Stockton California. August 13th, 1982 . From the internet.

I found this photo recently on the internet.

Seen here at Stockton California the very same year that the Union Pacific Railroad bought out the former Western Pacific through merger, is WP EMD Sw 1200 yard switcher # 606 wearing the later dark green and orange color scheme introduced during the early 1970's.