Context: Amtrak's Northeast Corridor and Chicago lines originate at South Station, which serves as a major intermodal transportation hub, and stop at Back Bay. Fast Northeast Corridor trains, which serve New York City, Washington, D.C., and points in between, also stop at Route 128 Station in the southwestern suburbs of Boston. Meanwhile, Amtrak's Downeaster service to Maine originates at North Station, despite the current lack of a dedicated passenger rail link between the two railhubs, other than the "T" subway lines.

Question: Where do Amtrack's Northeast corridor and Chicago lines start?
Answer: South Station

Question: Where do Amtrack's Northeast corridor and Chicago lines end?
Answer: Back Bay

Question: Trains serving new Yourk and Washington D.C also stop where?
Answer: Route 128 Station

Question: What suburbs of Boston is the Route 128 Station located in?
Answer: southwestern

Question: Where does the Downeaster service to maine start?
Answer: North Station