The Seattle Municipal Archives identifies this only as "Duwamish Substation transformer on the move, 1955." Presumably somewhere in West Seattle, Seattle, Washington.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/24256351@N04">Seattle Municipal Archives</a> from Seattle, WA
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/seattlemunicipalarchives/14320272920/">Duwamish Substation transformer on the move, 1955</a>