MBTA officials hope to have a clear answer in roughly two weeks about what caused a June 11 Red Line derailment as they await final test results from an outside laboratory.T officials said Monday that engineers have reviewed preliminary results of a metallurgical analysis undertaken to determine what caused a breakdown on the 50-year-old train car or its five-year-old wheel truck, but that they want to receive responses to several key questions before reaching a conclusion. [...]
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