Tutor Perini clashes with city's transportation agency over alleged design flaws that may push past December completion of its already-delayed $1.6-billion rail project.
The $2.4-billion, 1.5-mile No. 7 Subway Line Extension Project in Manhattan is the nation’s first of its kind to feature no federal funding as well as the innovative use of ground freezing in a 300-ft stretch for tunnel boring.