3rd and 16th streets, 1927. The elevated roadway was used to traverse railroad sidings to the east and west: http://sunsite.berkeley.edu/FindingAids/dynaweb/calher/cook/figures/I0051110A.jpg …
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@mwichary It was a pony truss, which in cross-section is "U" shaped.@SF_Historian -
@tobiemarx@SF_Historian Ah, I see! Fascinating.
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