Dennis, back in the days when the G ran, catenary stopped at New Haven. It did not go into Boston. As a kid I always dreamed of catenary to Boston so I could see a G pull into South Station. Today many loco railfans take commuter rail to the station to watch the Acela. It is not uncommon to see three or fout Acela trains in the station at the same time.
The Harrisburg trains came out of Philly.