Seventy-nine years ago this month Southern Pacific's Suisun Bay Bridge, crossing Carquinez Strait connecting Contra Costa and Solano counties, had its official opening. It was the longest double-track span in the west and eliminated the use of two large railroad ferries. The ceremonial crossing was made by the railroad's first locomotive, the C.P. Huntington, a 4-2-4 tank locomotive which is currently displayed at the California State Railroad Museum. It was followed by the railroad's most modern locomotive of the time, 4-8-4 #4408. The pier in the foreground was for the Mountain Copper Company which had a smelter there. (This was the basis for the name of SP's Mococo Line between Martinez and Tracy.) The bridge is now flanked on both sides with highway bridges.

This is a view looking west-northwest toward Mountain Copper Company's smelter plant before the Suisun Bridge was built (town of Benicia is in the background across the strait). Obviously, a major byproduct was fertilizer. The area was an important agricultural producer of grapes/wine, fruits, nuts, etc. the first half of the twentieth century until the coming of suburbia.
Mark