Sounding cautionary notes, MBTA officials are aiming to re-open the Braintree section of the Red Line and the Green Line's Boston College spur on Monday. The agency released the information in a Wednesday evening announcement that also said service between JFK/UMass station in Dorchester and North Quincy on the Red Line will likely resume on Friday, Feb. 20.

The E Line of the Green Line, which runs above ground by the Longwood Medical area, Northeastern University and the Museum of Fine Arts, could also re-open on Friday. Trolley service between Ashmont Station in Dorchester and Mattapan Square is slated to be available on Feb. 27.

The restoration plan comes as commuters struggle with delays, cancellations, erratic commuter rail schedules and shuttle buses meant to replace the loss of rail service. Transportation officials have blamed aging equipment and historic amounts of snow that have encased above-ground tracks.

"The goals we identified today will hinge on a number of factors, including weather conditions, and while we are making progress on recovering tracks and stations, we are also working hard to get train counts up," General Manager Beverly Scott said in a statement on Wednesday. "This will not be an easy task but our dedicated employees are working day and night to deliver the level of service the people of Massachusetts deserve."

Red Line service has been available from Ashmont Station to Alewife. The Orange Line, the Silver Line, the Blue Line, and the Green Line's C and D branches are currently open. Inmates have been deployed as diggers along the snow-covered tracks on the Red Line and the National Guard has worked to clear the tracks on Green Line routes.