Metro will reassemble thousands of rail car wheels based on federal data that indicates flaws in how they were pressed onto train axles. The report comes after a probe into a Blue Line derailment, uncovering a wheelset defect in several 7000-series cars.
allowed transit officials to conduct wheel inspections less frequently. That move freed Metro to ramp up train frequencies to a point where agency officials expect to run pre-pandemic levels of service this summer.Among the reports released Tuesday was an October 2022 test report from Kawasaki, the rail car manufacturer, which cited the results of what it calls the “wheel back to back distance investigation,” or “B-t-B.
But Metro also said separate probable cause theories raised by MxV involving vibration and temperature “are not conclusive and lack the supporting data to provide the level of certainty that Metro was seeking from MxV’s work.”The documents also point to long-running safety management issues facing Metro and underscore concerns raised by the rail system’s safety regulator.
She said that when the issue first was identified, the transit agency had no criteria that supervisors could reference to determine whether the wheelset issue should be elevated to other departments. Impastato told investigators that Metro is overhauling its process for reporting safety issues.
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