Paula Wallis reports for TunnelTalk
December 2011: The largest roadheader working in the USA today holed through to complete the topheading excavation of the Caldecott Fourth Bore NATM tunnel. Two of seven cross passages on the following bench work are also complete. The $420 million project received $197 million under the provisions of President Obama's American Recovery and Reinvestment Act of 2009, commonly known as Federal stimulus funds. It is the largest Recovery Act allocation in the nation to date. The tunnel is scheduled for completion in late 2013-early 2014.