Today I learned, from Sally, to always sit on the northeast side of the Red Line: on the right going out of Boston and on the left going in. This way, you get a glorious view of the Charles. We saw zillions of small sailboats in the setting sun in the evening, then dedicated crew teams in the morning sun.
As an added bonus, there is an ad poster series set up to work as animation, at one point, on the wall of the outbound train.
Thanks, Sal!