jump

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They also found that the flange, or the protrusion on the inner side of a wheel that secures it on the track, on the right wheel of the car that derailed showed traces of having run over the track for about 5 meters before actually jumping the track, the officials said.
Chicago - An emergency track-side braking system activated but failed to stop a Chicago commuter train from jumping the tracks and barreling to the top of an escalator at O'Hare International Airport, a federal investigator said Tuesday.
The train broke loose early on Saturday and sped downhill in the darkness for nearly seven miles before jumping the tracks at 63mph.