Wheel assembly on Metro rail cars had failed repeatedly, NTSB says; reduced service expected all week

Joe Gordon, the NTSB’s chief investigator, said because wheels on the car involved in last week’s derailment had shifted outward, when it passed over a switch, it was bumped off the rails. Gordon said passing another switch knocked it back on, explaining the two previous derailments. But outside Rosslyn, where the train left the tracks for the final time, Gordon said there was no switch involved.


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