The MBTA’s long-running effort to replace its Red and Orange Line fleets faced renewed schedule pressures this fall, with transit officials highlighting a recent shift toward more consistent Red Line production as the Orange Line order nears its finish line.

Shipments of Chinese-manufactured train shells have slowed in recent months — in part because of ongoing federal forced-labor reviews — contributing to delays that pushed the builder past a September delivery deadline for the Orange Line.

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Although the federal reviews have introduced uncertainty into the supply chain, MBTA leaders said the broader fleet-replacement program continues to move forward, supported by a production strategy that now places greater emph

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