In 2008, I joined Pulitzer Prize winner Walt Bogdanich at The New York Times to look into rumors of pension fraud at the Long Island Rail Road, the nation's busiest commuter line. The ensuing investigation revealed that nearly all former LIRR employees were getting federal disability payments. Many enjoyed their "disabled" retirement by playing golf. The series led to over 30 criminal convictions, and dozens of former workers avoided prosecution by admitting guilt and giving up their benefits. Federal prosecutors said the scam could have cost the Railroad Retirement Board more than $1 billion if all the funds had been disbursed.