(Bloomberg) — The engineer operating an Amtrak train that derailed in Philadelphia last year pushed its throttle to full, increasing the train's speed to 106 miles per hour, before entering a sharp curve, according to documents released by the National Transportation Safety Board Monday.

While not pinpointing a cause, the approximately 2,000 pages of documents rule out a number of potential contributing factors. Investigators have found no evidence of failures involved with the track, the locomotive and the signals that direct the engineer that could have caused the accident, a safety board official briefing reporters said on Monday.

The train's engineer previously told investigators he can't recall the moments immediately before the crash. According to a November interview made public on Monday, he described realizing the train was in a sharp curve and attempting emergency braking maneuvers.

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