To misquote the poet Emily Dickinson, something there is that loves a line. When I was growing up in the 80s in Dorchester, near Ashmont station on the red line, I remember the fights in the press about extending the red line all the way to Alewife from Harvard Station, where it ended at the time. Some residents of Arlington, it seemed, wanted the red line kept out so that some other, less visible lines would kept firmly IN. They expressed concern that poor blacks from Dot were going to get on the T at Shawmut or Field’s Corner, and ride in air-conditioned comfort all the way to Alewife, for the express purpose of burgling their homes. Presumably, then, the would-be burglars would take a cab back to Dot with all their booty.