Boston's 1983 MBTA safety crisis
A series of accidents and fires led to a federal investigation and a court-ordered safety monitoring program by the National Transportation Safety Board.
The MBTA committed to extensive track and signal upgrades and hired more inspectors.
The system regained autonomous operation but struggled with decades of underinvestment that later resurged in the 2000s.
Illustrates that past oversight episodes have not prevented long-term decline; vigilance after relinquishment is critical.
