Red is potential new line replacing and extending silverline (through roxbury and everett both dense urban areas close to the city but severely underserved by rail)
The blue in east boston is a potential sprur up meridian street to eagle hill.
The blue in Roxbury/ mission hill is a an option for an extension of the E line to blue hill/seaver.
The pink is how this could fit into an urban ring. The purple is an inside ring through Mission hill, Dudley and Uphams. The ring could also rely on the washington line but it would leave out north dorchester and the historic parts of southie.
Green is a potential street car line down broadway in southie.
X