New York state Comptroller Thomas DiNapoli says he found overtime abuses totaling more than $1 million at the authority that runs New York City's transit system.
DiNapoli says workers at the Metro North and Harlem lines of the Metropolitan Transportation Authority inflated salaries and pensions through the practice.
The Democrat on Wednesday also claimed MTA's management tolerated the abuse.
This was a result of the so-called forensic audit that DiNapoli promised a year ago after the MTA sought toll and fare increases.
The MTA's inspector general is investigating and the authority has already taken several corrective measures.
Last summer, the MTA stopped the practice in which signal supervisors signed their own time cards.