The folks at Railroad.net report the Grand Junction bridge over the Charles River - which connects rail lines north and south of the city - has had to be shut again, only three months after it was re-opened following extensive repairs.
The bridge is used for produce shipments to the Chelsea market and lets Amtrak and MBCR ferry trains to repair facilities on either side of the Charles (South Boston for Amtrak, Somerville for MBCR). With the bridge shut again, trains have to go on a circuitous route via Worcester County.
A couple years ago, state officials bought the Grand Junction bridge and East Cambridge rail line in the hopes of routing some Worcester Line trains to North Station. They've since shelved those plans.