CHICAGO — A union representative and the Chicago Transit Authority (CTA) could not come to an agreement on how many hours the operator in last week’s derailment had worked before the crash at the O’Hare International Airport station, Chicago Tribune reported.

The representative said the operator, a fill-in employee, had worked 69 hours in the seven days before the crash. However, a CTA spokesperson said that the operator worked 55 hours during that time and was off for 18 hours before her shift during which the accident occurred.

The agency also said that the operator had requested additional work hours — two shifts that added up to 13.6 hours — her right under the union's collective bargaining agreement. For the full story, click here.