Construction workers watch as one of two 50-ton steel girders is lifted into place at the Terminal Modernization Program site on the night of March 8. (Photo by Beth Hollerich)

Last week marked a hefty milestone for Pittsburgh International Airport’s new terminal program: the installation of two 50-ton steel girders to form a structural slab foundation using a 200-foot crane.

The procedure required an hours-long shutdown of the trains that run between the terminals in order to maintain maximum safety for staff, construction workers and passengers.

To see and hear more about this extraordinary effort, check out the video  below.