Four Chicago Transit Authority employees have been fired following last month's derailment of a Green Line train on the city's South Side.
The train's front and rear operators, as well as a supervisor overseeing the shuttle operation and a control tower employee were initially suspended without pay during an investigation into the accident.
The employees' union doesn't believe the firings are justified.
Thirty-four passengers refused treatment.
The derailment happened at the same spot as a May 2008 derailment. The National Transportation Safety Board has yet to conclude its investigation in that case, the preliminary finding was operator error.