"Workers in the East Side Access tunnel, which will connect Grand Central Terminal in Manhattan with the Long Island Rail Road. The project’s costs have ballooned to nearly $3.5 billion for each new mile of track."

An accountant discovered the discrepancy while reviewing the budget for new train platforms under Grand Central Terminal in Manhattan.

The budget showed that 900 workers were being paid to dig caverns for the platforms as part of a 3.5-mile tunnel connecting the historic station to the Long Island Rail Road. But the accountant could only identify about 700 jobs that needed to be done, according to three project supervisors. Officials could not find any reason for the other 200 people to be there.

“Nobody knew what those people were doing, if they were doing anything,” said Michael Horodniceanu, who was then the head of construction at the Metropolitan Transportation Authority, which runs transit in New York. The workers were laid off, Mr. Horodniceanu said, but no one figured out how long they had been employed. “All we knew is they were each being paid about $1,000 every day.”

The discovery, which occurred in 2010 and was not disclosed to the public, illustrates one of the main issues that has helped lead to the increasing delays now tormenting millions of subway riders every day: The leaders entrusted to expand New York’s regional transit network have paid the highest construction costs in the world, spending billions of dollars that could have been used to fix existing subway tunnels, tracks, trains and signals."