UPDATE, 7 a.m.: Equipment removed, T reports "minor" residual delays.
The T is running shuttle buses between North Quincy and JFK/UMass due to "disabled work equipment" at Savin Hill. A T spokesman adds:
MBTA crews are on scene, working hard to get the piece of equipment off the main line. Customers may also board Commuter Rail trains at Braintree, Quincy Center and JFK for service into South Station. Customers are asked to allow extra time to commute.