Dozens of aging subway cars running on Boston's Red Line are to receive long-overdue maintenance as part of a $46 million public-transit overhaul. The cars, which date from the late 1980s, missed their scheduled mid-life servicing due to budget constraints, contributing to equipment failures and service delays. Now that cash is finally available, the cars are being processed at a specially constructed 6-station assembly line designed to handle everything from graffiti removal to HVAC and propulsion-system replacements.

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