Human error found in Green Line trolley derailment; driver has been fired, source says

The Green Line trolley derailment that injured 10 people Monday was a result of human error, the MBTA said today.

An investigation determined that the driver, whose trolley crashed into a tunnel wall, had “failed to operate his trolley in compliance with speed and signal requirements,” T spokesman Joe Pesaturo said.

Officials had already said they had ruled out problems with the track, the signals, the switch, and the trolley involved in the crash.

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The investigation was conducted by the T’s operations division, Pesaturo said.

Also today, an official briefed on the investigation said that Sydley Gardner, 48, the driver, had been fired.

The crash happened at 12:20 p.m. Monday where the Green Line’s C and D branches intersect just west of Kenmore Station. Ten people were sent to the hospital.

Gardner had been fired before, in 2010, for failing to report a collision with a pedestrian. But the T was forced to rehire Gardner after an arbitrator ruled in his favor, said Transportation Secretary Richard A. Davey, who was MBTA general manager when Gardner was fired.

Gardner also had a long, checkered record as a driver of cars, the Globe reported, with 20 moving violations between 1984 and 2009, according to Registry of Motor Vehicle records.