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B

Green Line B

Subway · Route B

Medford/Tufts ↔ Boston College

1 alert Every 8–9 min 5:01 AM – 1:45 AM 1 train live
Track live
Direction
Live · as of 1:32 AM

Stations, live trains and next arrivals

Service alertGreen Line: No trains between North Station & Babcock St (B), Kenmore (C+D), & Heath St (E), October 31 - November 1. Use buses between Babcock, Kenmore, Heath St (Rt 39) & Copley/Back Bay. Use Orange Line between North Station & Back Bay.
Live data is delayed.
  • Not tracked · to Boston College
  1. Medford/TuftsCE3 bus routesNo more trains
  2. Ball SquareCE8 bus routesNo more trains
  3. Magoun SquareCENo more trains
  4. Gilman SquareCE8 bus routesNo more trains
  5. East SomervilleCE5 bus routesNo more trains
  6. LechmereCDE11 bus routesNo more trains
  7. Science Park/West EndCDE8 bus routesNo more trains
  8. NorthOrangeCDECRCRCRCR17 bus routesElevator outNo more trains
  9. HaymarketOrangeCDE26 bus routesElevator outNo more trains
  10. Government CenterBlueCDE26 bus routesNo more trains
  11. Park StreetRedCDE17 bus routesNo more trains
  12. BoylstonCDE9 bus routesNo more trains
  13. ArlingtonCDE9 bus routesNo more trains
  14. CopleyCDE20 bus routesNo more trains
  15. Hynes Convention CenterCD14 bus routesNo more trains
  16. KenmoreCD28 bus routesNo more trains
  17. Blandford Street13 bus routesNo more trains
  18. Boston University East13 bus routesNo more trains
  19. Boston University Central13 bus routesNo more trains
  20. Amory Street11 bus routesNo more trains
  21. Babcock Street12 bus routes7 min
  22. Packard's Corner2 bus routes12 min
  23. Harvard Avenue8 bus routes14 min
  24. Griggs Street4 bus routes16 min
  25. Allston Street4 bus routes17 min
  26. Warren Street4 bus routes18 min
  27. Washington Street9 bus routesElevator outDueNot trackedthen 20 min
  28. Sutherland Road6 bus routes2 minNot trackedthen 22 min
  29. Chiswick Road6 bus routes4 minNot trackedthen 24 min
  30. Chestnut Hill Avenue7 bus routes5 minNot trackedthen 25 min
  31. South Street6 bus routes7 minNot trackedthen 27 min
  32. Boston College6 bus routesNo more trains
  1. Boston College6 bus routesNo more trains
  2. South Street6 bus routesNo more trains
  3. Chestnut Hill Avenue7 bus routesNo more trains
  4. Chiswick Road6 bus routesNo more trains
  5. Sutherland Road6 bus routesNo more trains
  6. Washington Street9 bus routesElevator outNo more trains
  7. Warren Street4 bus routesNo more trains
  8. Allston Street4 bus routesNo more trains
  9. Griggs Street4 bus routesNo more trains
  10. Harvard Avenue8 bus routesNo more trains
  11. Packard's Corner2 bus routesNo more trains
  12. Babcock Street12 bus routesNo more trains
  13. Amory Street11 bus routesNo more trains
  14. Boston University Central13 bus routesNo more trains
  15. Boston University East13 bus routesNo more trains
  16. Blandford Street13 bus routesNo more trains
  17. KenmoreCD28 bus routesNo more trains
  18. Hynes Convention CenterCD14 bus routesNo more trains
  19. CopleyCDE19 bus routesNo more trains
  20. ArlingtonCDE9 bus routesNo more trains
  21. BoylstonCDE9 bus routesNo more trains
  22. Park StreetRedCDE17 bus routesNo more trains
  23. Government CenterBlueCDE26 bus routesNo more trains
  24. HaymarketOrangeCDE26 bus routesElevator outNo more trains
  25. NorthOrangeCDECRCRCRCR17 bus routesElevator outNo more trains
  26. Science Park/West EndCDE8 bus routesNo more trains
  27. LechmereCDE12 bus routesNo more trains
  28. East SomervilleCE5 bus routesNo more trains
  29. Gilman SquareCE8 bus routesNo more trains
  30. Magoun SquareCENo more trains
  31. Ball SquareCE8 bus routesNo more trains
  32. Medford/TuftsCE3 bus routesNo more trains
Live arrival Grey times are scheduled Not tracked: scheduled, but no train is reporting Transfer station

Timetable

Scheduled departures for any day MBTA has published. For live arrivals, use the diagram above.

Weekday schedule Mon, Nov 2

6 AM
next 20

On-time performance

How much of the time trains ran early, on time or late, hour by hour.

No on-time data for the Green Line B yet.

It builds up from live positions while trains are running. On time: no more than 1 min early or 5 min late, sampled once a minute from live positions.

Connections

Rail lines and bus routes you can transfer to from the Green Line B.

Rail

C Green Line C

Transfer at 16 stations: Medford/Tufts, Ball Square, Magoun Square…

 E Green Line E

Transfer at 14 stations: Medford/Tufts, Ball Square, Magoun Square…

 D Green Line D

Transfer at 11 stations: Lechmere, Science Park/West End, North…

 Orange Orange Line

Transfer at North and Haymarket

 CR Fitchburg Line

Transfer at North

 CR Haverhill Line

Transfer at North

 CR Lowell Line

Transfer at North

 CR Newburyport/Rockport Line

Transfer at North

 Blue Blue Line

Transfer at Government Center

 Red Red Line

Transfer at Park Street

Bus

And 42 more routes at stops along the way. 89/93Clarendon Hill – Haymarket Station92Sullivan Square Station – Downtown via Main Street93Sullivan Square Station – Downtown via Bunker Hill StreetGreen Line C ShuttleSaint Mary's Street – KenmoreGreen Line D ShuttleWoodland – Copley via Riverside (Express)Orange Line ShuttleSullivan Square – StateRed Line ShuttleQuincy Center – Broadway (Express)ShuttleCleveland Circle – Kenmore (Shuttle)10City Point – Arlington Station43Ruggles Station – Park Street Station88Clarendon Hill – Lechmere Station111Woodlawn – Haymarket Station116Wonderland Station – Maverick Station354North Burlington – State Street, Boston426Central Square, Lynn – Haymarket or Wonderland Station428Oaklandvale – Haymarket Station501Brighton Center – Federal Street & Franklin Street504Watertown Yard – Federal Street & Franklin StreetBlue Line ShuttleWonderland – Suffolk DownsSL5Nubian Station – Temple Place85Assembly Row – Ruggles Station1Harvard Square – Nubian Station8Harbor Point – Kenmore Station11City Point – Chauncy Street & Summer Street19Fields Corner Station – Kenmore or Ruggles Station60Chestnut Hill – Kenmore Station69Harvard Square – Lechmere Station87Arlington Center – Lechmere Station89Clarendon Hill or Davis Station – Sullivan Square Station90Davis Station – Assembly Row91Sullivan Square Station – Central Square, Cambridge94Medford Square – Davis Station96Medford Square – Harvard Station109Linden Square – Harvard Square via Sullivan450Salem Depot – Wonderland or Haymarket StationHaverhill Line ShuttleReading – Oak GroveNewburyport/Rockport Line ShuttleSwampscott – North Station (Limited)SL4Nubian Station – South Station47Central Square, Cambridge – Broadway Station65Brighton Center – Ruggles Station66Harvard Square – Nubian Station86Harvard Square – Reservoir Station

About the Green Line B

The Green Line B (MBTA route B) is a Subway line with 32 stations between Medford/Tufts and Boston College.

Times with the live mark come from each train's GPS and MBTA's real-time predictions. Times marked "Not tracked" are scheduled trips with no train reporting. All other times are from MBTA's published schedule (feed Fall 2026, 2026-10-30T17:51:33+00:00, version D).

How often does the Green Line B run?

Every 8–9 min for most of the day on weekdays, based on the published schedule.

When does the Green Line B start and stop?

The first train leaves around 5:01 AM and the last arrives around 1:45 AM.

Is the Green Line B the same as route B?

Yes. MBTA's schedule data lists the Green Line B as route B.