GO trains already through-run through Union Station in Toronto. However, the RER proposal will electrify the GO network and provide an all-day 15 min service on 5 of the 7 GO lines making the system a true regional rail network. References External links SEPTA stations and terminals Railroad tunnels in Pennsylvania Transportation buildings and structures in Philadelphia Tunnels completed in 1984 Buildings and structures in Philadelphia Underground commuter rail Tunnels in Philadelphia Rail transportation in Philadelphia