NEW YORK - APRIL 12: A Metropolitan Transportation Authority (MTA) worker walks in an underground tunnel for the long-proposed 2nd Avenue subway line April 12, 2007 in New York City. A groundbreaking ceremony was held for the line, one of numerous since the project was first proposed 80 years ago. The first phase of the line is scheduled to be completed in 2013, running from 96th Street to 63rd Street at a cost of $3.8 billion. Upon completion, line would add 8.5 miles of tracks and carry five million riders on weekdays in four of New York City's five boroughs. (Photo by Spencer Platt/Getty Images)
Inspector General Barry L. Kluger says problems with awarding contracts have caused further delays and added another $120 million to the tab.
The Metropolitan Transportation Authority says it has adopted cost-saving measures.
The New York Times obtained Kluger's response to Manhattan Borough President Scott Stringer, who had sought explanations.
Federal officials now estimate the first phase of work will be completed in February 2018. The MTA's estimate is July 2017.
It's being built to reduce crowding on the Lexington Avenue line. The neighborhood lost its Second Avenue Elevated in 1940.