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On the outskirts of Sacramento, Elvas Tower protects a major Southern Pacific junction. It was built around 1911 with a 45 lever GRS electric interlocker. To the west is the line to Oakland, to the east Roseville Yard, and to the south is the line down the San Joaquin Valley to Bakersfield and over Tehachapi Pass. It is late in the afternoon and a local returns to Roseville from Davis pulled by switch engine 2527 on June 10, 1987. Engines 9185 9341, 7415, 7452, 9393, and 8494 pull freight train symbol WCRVM passed the tower and on toward the big yard at Roseville. Disk 25