The MBTA Commuter Rail system is a regional rail network that reaches from Boston into the suburbs of eastern Massachusetts.
The system consists of twelve main lines, three of which have two branches.
The rail network operates according to a spoke-hub distribution paradigm, with the lines running radially outward from the city of Boston.
Eight of the lines converge at South Station, with four of these passing through Back Bay station.
The other four converge at North Station.
There is no passenger connection between the two sides; the Grand Junction Railroad is used for non-revenue equipment moves accessing the maintenance facility.
The North–South Rail Link has been proposed to connect the two halves of the system; it would be constructed under the Central Artery tunnel of the Big Dig.

Special MBTA trains are run over the Franklin Line and the Providence/Stoughton Line to Foxborough station for New England Patriots home games and other events at Gillette Stadium.
The CapeFLYER intercity service, operated on summer weekends, uses MBTA equipment and operates over the Middleborough/Lakeville Line.
Amtrak runs regularly scheduled intercity rail service over four lines: the Lake Shore Limited over the Framingham/Worcester Line, Acela Express and Northeast Regional services over the Providence/Stoughton Line, and the Downeaster over sections of the Lowell Line and Haverhill Line.
Freight trains run by Pan Am Southern, Pan Am Railways, CSX Transportation, the Providence and Worcester Railroad, and the Fore River Railroad also use parts of the network.

The first commuter rail service in the United States was operated over what is now the Framingham/Worcester Line beginning in 1834.
Within the next several decades, Boston was the center of a massive rail network, with eight trunk lines and dozens of branches.
By 1900, ownership was consolidated under the Boston and Maine Railroad to the north, the New York Central Railroad to the west, and the New York, New Haven and Hartford Railroad to the south.
Most branches and one trunk line – the former Old Colony Railroad main – had their passenger services discontinued during the middle of the 20th century.
In 1964, the MBTA was formed to subsidize the failing suburban railroad operations, with an eye towards converting many to extensions of the existing rapid transit system.
The first unified branding of the system was applied on October 8, 1974, with "MBTA Commuter Rail" naming and purple coloration analogous to the four subway lines.
The system continued to shrink – mostly with the loss of marginal lines with one daily round trip – until 1981.
The system has been expanded since, with four lines restored (Fairmount Line in 1979, Old Colony Lines in 1997, and Greenbush Line in 2007), six extended.,
and a number of stations added and rebuilt.

Several further expansions are planned or proposed.
The South Coast Rail project, for which preliminary construction began in 2014, would extend the Stoughton section of the Providence/Stoughton Line to Taunton, with two branches to New Bedford and Fall River.
Extensions of the Providence/Stoughton Line to Kingston, the Middleborough/Lakeville Line to Buzzards Bay, and the Lowell Line into New Hampshire are also proposed.
Infill stations at Boston Landing, Blue Hill Avenue, West Station, and South Salem are under construction or planned.

Each commuter rail line has up to eleven fare zones, numbered 1A and 1 through 10.
Riders are charged based on the number of zones they travel through.
Tickets can be purchased on the train, from ticket counters or machines in some rail stations, or with a mobile app.
If a local vendor or ticket machine is available, riders will pay a surcharge for paying with cash on board.
Fares range from $2.25 to $12.50, with multi-ride and monthly passes available.
In 2016, the system averaged 122,600 daily riders, making it the fourth-busiest commuter rail system in the nation.

The MBTA commuter rail network was the first in the nation to offer free on-board Wi-Fi.
It offers Wi-Fi-enabled coaches on all train sets.
The MBTA Commuter Rail system is a regional rail network that reaches from Boston into the suburbs of eastern Massachusetts. The system consists of twelve main lines, three of which have two branches. The rail network operates according to a spoke-hub distribution paradigm, with the lines running radially outward from the city of Boston. Eight of the lines converge at South Station, with four of these passing through Back Bay station. The other four converge at North Station. There is no passenger connection between the two sides; the Grand Junction Railroad is used for non-revenue equipment moves accessing the maintenance facility. The North–South Rail Link has been proposed to connect the two halves of the system; it would be constructed under the Central Artery tunnel of the Big Dig.
Special MBTA trains are run over the Franklin Line and the Providence/Stoughton Line to Foxborough station for New England Patriots home games and other events at Gillette Stadium. The CapeFLYER intercity service, operated on summer weekends, uses MBTA equipment and operates over the Middleborough/Lakeville Line. Amtrak runs regularly scheduled intercity rail service over four lines: the Lake Shore Limited over the Framingham/Worcester Line, Acela Express and Northeast Regional services over the Providence/Stoughton Line, and the Downeaster over sections of the Lowell Line and Haverhill Line. Freight trains run by Pan Am Southern, Pan Am Railways, CSX Transportation, the Providence and Worcester Railroad, and the Fore River Railroad also use parts of the network.
The first commuter rail service in the United States was operated over what is now the Framingham/Worcester Line beginning in 1834. Within the next several decades, Boston was the center of a massive rail network, with eight trunk lines and dozens of branches. By 1900, ownership was consolidated under the Boston and Maine Railroad to the north, the New York Central Railroad to the west, and the New York, New Haven and Hartford Railroad to the south. Most branches and one trunk line – the former Old Colony Railroad main – had their passenger services discontinued during the middle of the 20th century. In 1964, the MBTA was formed to subsidize the failing suburban railroad operations, with an eye towards converting many to extensions of the existing rapid transit system. The first unified branding of the system was applied on October 8, 1974, with "MBTA Commuter Rail" naming and purple coloration analogous to the four subway lines. The system continued to shrink – mostly with the loss of marginal lines with one daily round trip – until 1981. The system has been expanded since, with four lines restored (Fairmount Line in 1979, Old Colony Lines in 1997, and Greenbush Line in 2007), six extended., and a number of stations added and rebuilt.
Several further expansions are planned or proposed. The South Coast Rail project, for which preliminary construction began in 2014, would extend the Stoughton section of the Providence/Stoughton Line to Taunton, with two branches to New Bedford and Fall River. Extensions of the Providence/Stoughton Line to Kingston, the Middleborough/Lakeville Line to Buzzards Bay, and the Lowell Line into New Hampshire are also proposed. Infill stations at Boston Landing, Blue Hill Avenue, West Station, and South Salem are under construction or planned.
Each commuter rail line has up to eleven fare zones, numbered 1A and 1 through 10. Riders are charged based on the number of zones they travel through. Tickets can be purchased on the train, from ticket counters or machines in some rail stations, or with a mobile app. If a local vendor or ticket machine is available, riders will pay a surcharge for paying with cash on board. Fares range from $2.25 to $12.50, with multi-ride and monthly passes available. In 2016, the system averaged 122,600 daily riders, making it the fourth-busiest commuter rail system in the nation.
The MBTA commuter rail network was the first in the nation to offer free on-board Wi-Fi. It offers Wi-Fi-enabled coaches on all train sets.
Massachusetts Bay Transportation Authority