Main Station

Main Station is a transfer station of the Red Line, Timothy Overground, Orange Line and Silver Line trains. It had the largest platforms, which is 22 platforms.

Commuter Rail

 * Platform 1 to 4 are located at Basement 1 and is used for the commuter rail trains that can go from Main Station to Ernest's Computer Station, such as Acela Express and Acela Regional.
 * Platform 5 to 11 are located at Level 1 and is used for the commuter rail trains to Fitchburg, Lowell, Haverhill and Framingham.
 * Platform 12 to 14 are located at Level 1 and is used for the Airport Express trains to Logan Airport.