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Metro’s 5000 Series cars have been perennially more prone to breakdowns than most others in the fleet, which has led the agency to plan to retire the cars by the end of the year.
By 2010, an electrical part used to transfer power from the third rail to the car had begun to “routinely and catastrophically” fail in 2010, the report of investigation said.
Metro engineers brought in an electronics company to deal with the issue, and it suggested pairing the insulated gate bipolar transistor with another part.
“The OIG investigation revealed the company misrepresented the IGBTs as their own by physically altering the exterior housing and providing product literature, potentially in violation of the original manufacturer’s copyright,” the report said.