Ground_Freezing_System_in_Operation_while_Commuter_Trains_Run_Through_the_Big_Dig.gif

No higher resolution available.

Description Ground Freezing System in Operation while Commuter Trains Run Through the Big Dig.gif	Ground Freezing System in Operation while Commuter Trains Run Through the Big Dig.
Date	Unknown date Unknown date
Source	http://www.fhwa.dot.gov/bridge/tunnel/pubs/nhi09010/12.cfm
Author	US DoT
Permission ( Reusing this file )	Public domain Public domain false false This image is a work of a United States Department of Transportation employee, taken or made as part of that person's official duties. As a work of the U.S. federal government , the image is in the public domain .