Photo taken by The Goat
License: Creative Commons Attribution-NonCommercial-ShareAlike (CC BY-NC-SA)
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BH Photo #247832
Gerrick & Gerrick did work on the lost 15th Street Bridge in Tacoma mid 1910s. Converted it to both railroad and vehicular traffic on a swing span.
They appear to have done the same here on a lift.
Image I found of.