Back Bay to Framingham

From the passenger station with platforms on all tracks at Back Bay (MP 227.6/1.2), the Amtrak line swings south-southwest while the former Conrail line continues just south of due west, double track, CTC, speed limit 30 mph, past the MBTA passenger station at Yawkey, Sewell's Point, where a line to Newton once left to the southwest and the main line turns northwest, MP 2.5, where the speed limit rises to 40 mph, Allston/CP-3 (MP 3.1), east end of Beacon Park Yard on the north side, where the line turns west and reduces to single track, the passenger speed limit rises to 50 mph, and the East Boston branch trails in from the northeast at a wye on the north side of the yard, and Brighton/CP-4 (MP 4.8), west end of the yard, where the line expands to double track, again, and the passenger speed limit rises to 60 mph.

There is an MBTA passenger station at Newtonville (MP 8.1), an MBTA passenger station at West Newton (MP 9.1), and an MBTA passenger station at Auburndale (MP 10.2), a turn south-southwest with a passenger speed restriction of 55 mph between MP 10.4 and MP 10.7, reverting to 60 mph thereafter, Riverside (MP 10.6), where a branch to Newton once headed away southeast, CP-11 (MP 11.4), a passenger speed restriction of 55 mph between MP 11.5 and MP 12.2, reverting to 60 mph thereafter, an MBTA passenger station at Wellesley Farms (MP 12.5), where the line turns southwest, a passenger speed restriction of 55 mph on Track 1 between MP 13.4 and MP 13.6, an MBTA passenger station at Wellesley Hills (MP 13.5), where the line turns west-southwest, an MBTA passenger station at Wellesley Square (MP 14.7), and an MBTA passenger station at Natick (MP 17.7), where the line turns west and Saxonville Industrial Track heads away north.

There is an MBTA passenger station at West Natick, a speed restriction of 30 mph between MP 20.9 and CP-22, the junction at CP-21 (MP 21.3), where the Framingham Secondary from Mansfield trails in from the southeast and continues northwest, across the line, to East Fitchburg, an MBTA passenger station at Framingham (MP 21.4), and the junction at CP-22 (MP 21.7), where the Holliston Industrial Track  heads south and the main line heads west-southwest.