The MBTA & Keolis have announced a service change for Tuesday 2/7/2017 for the Framingham-Worcester line: the morning HeartToHub will operate as a full length local train making all station stops. The theory is that by having this train make extra stops, it increases the overall passenger capacity for all of the intermediate stops - potentially helping alleviate overcrowding on ALL trains.
I've attempted to make an UNOFFICIAL very rough ESTIMATE of the schedule for it here:
P552 - AM Heart To Hub:
Worcester: 8:05 AM
Grafton: 8:18 AM
Westboro: 8:22 AM
Southboro: 8:31 AM
Ashland: 8:35 AM
Framingham: 8:46 AM
West Natick: 8:51 AM
Natick Center: 8:56 AM
Wellesley Square: 9:01 AM
Wellesley Hills: 9:05 AM
Wellesley Farms: 9:08 AM
Auburndale: 9:13 AM
West Newton: 9:16 AM
Newtonville: 9:19 AM
Yawkey: 9:29 AM
Back Bay: 9:34 AM
South Station: 9:40 AM
This schedule assumes that P586 departs Framingham on-time and operates ahead of P552. The above schedule is NOT official and is probably VERY OPTIMISTIC - but it should be generally close to what might happen.
The official page with updates is here (http://www.mbta.com/events) although as of early Monday afternoon it didn't yet have details about the conversion of the HeartToHub to a local train.
Expect overcrowding on many trains - try to move your AM commute / trip earlier since earlier trains (pre-7 AM departures) will have more capacity on them. The weather certainly won't help with on-time performance...but I would rather be having some delayed trains if it means we're celebrating another Super Bowl win!