The story of the Orange Line is the story of Boston: always in flux but trailed by its long history. Since 1901, this rail lines configuration has evolved in response to changes in the city, society, and technology. Hazardous sections have been eliminated, ownership has transitioned from private to public, and the line has been rerouted to serve growing suburbs and to use land cleared for the failed Inner Belt. Both its northern terminus, which shifted from Everett to Malden, and the southern route, realigned from Washington Street to the Southwest Corridor, have seen dramatic transformations...