Most interesting. It looks like a dry-land method similar to the replacement of South Shore's Calumet River bridge in the early 1960's and N&W's ex-NKP Calumet River bridge (a vertical lift span) in 1969.
Finished weekend of Aug 31 . Just some stills but link inside to earlier roll in that predates the south shore bridge.
http://www.mbta.com/uploadedfiles/About_the_T/T_Projects/T_Projects_List/Route%2062%20Roll-In%20Presentation%20with%20video%20link.pdf
Overview
http://www.mbta.com/about_the_mbta/t_projects/default.asp?id=15585
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