Apparently the T fixed the problem this morning, but here's the planned outage schedule just in case.
Commuter Rail Schedule For Friday, February 19, 2016
Below, the Commuter Rail Schedule for Thursday Evening, February 18, 2016
If traveling out of South Station on Commuter Rail please heed the MBTA's advice above.
And if traveling Red or Orange Line Trains please note there will be extra trains BUT a lot of extra traffic!